1997-2025 Ford F150 Eaton Detroit TrueTrac Helical Gear Limited Slip Differential (9.75 inch 34-Spline) | 913A477

1997-2025 F150 9.75 inch Eaton TrueTrac Limited Slip Differential

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Part#:

913A477

17 Review(s) Write a Review

61 Customer Q&A(s)

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Product Features
17 Customer Review(s)
61 Q&A(s)
Product Videos

F150 Eaton TrueTrac Features:

Greatly improves rear end traction and handling
Features a reliable Helical Gear LSD design
Near-instant engagement
Does not require friction modifier or clutch replacement
Drop-in replacement for stock differential
For F150s with 34-spline 9.75" rear ends only

High-Performance Helical Gear Limited Slip Differential with Quiet Operation

Eaton's Detroit TrueTrac Limited Slip Differentials have long been one of the top-dogs when it comes to performance drivetrain upgrades, and adding one these bad boys to your 1997 to 2025 F150's rear end will enable your aggressive truck build to claw its way out of just about everything while maintaining OE on-road drivability all without costing an arm and a leg like a full locking differential. The Detroit TrueTrac Limited Slip Differential features a Helical Gear-style internal design with helical-cut gears instead of clutch packs, which allows for much greater longevity and reliability in performance applications than LSD systems that use more standard clutch packs. The TrueTrac has smooth, quiet operation, and they only way you'll know if it's engaged is when your truck suddenly has more traction.

Automatic Engagement with a Maintenance-Free Design

Eaton carefully designed and constructed their Detroit TrueTrac limited slip differential to handle just about any application you have in mind. The TrueTrac has precision-cut helical gears and pinions housed inside a high-strength flanged body with covers that all comes pre-assembled and ready to drop into your truck's rear axle. The TrueTrac has no wearable parts and requires no maintenance other than standard differential fluid changes. The differential automatically and smoothly engages when a wheel experiences traction loss. During normal driving, the TrueTrac operates like a standard open differential to keep your street drive smooth and noise-free. The TrueTrac is designed to drop right into place of the stock differential on 1997-2025 F150s with 9.75" rear ends and 34-spline axles.

1997-2025 F150s only: this differential only fits Ford 9.75" rear ends with 34-spline axles, like those found on 1997 to 2025 F150s.

Will not fit SVT Raptors: this locker will not fit SVT Raptors, due to the fact that Raptors have 35-spline axles.

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2014 Ford F-150 3.5L Platinum 4x4

Note much to say except this thing is a monster! While not quite an elocker or air locker it performs very well on the trail. No delay in a lock like a LSD and hills I had trouble with I can now climb without even needing my front locker. Additionally traction on the hard pavement is better and rarely will your tires break loose resulting in better acceleration due to no loss of traction. Best $560 spent on my truck so far. (well, the gears are a close second)

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Reviewed by: Mike B from New Mexico on 5/19/2016

2019 f-150 RCSB

picture is worth a thousand words

1997-2025 F150 9.75 inch Eaton TrueTrac Limited Slip Differential Review Image!

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Reviewed by: michael from maryland on 10/31/2019

2016 F150 3.5 Ecoboost

The True Trac box was in pretty bad shape when it arrived and I hoped it didn't damage the unit. The guy who installed it said it was fine. It works great! No more one wheel peel and it is smooth and quiet! The Stage 3 guys said to take pictures of the damaged box and if the True Trac was damaged, they would make it right. I can't ask for much more than that.

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Reviewed by: Ken Newman from Queen Creek on 6/23/2018

2012 F150

I had my local mechanic install the LSD. Even on dry streets, I noticed a difference in traction and handling. Taking it out to the property after a rain, this unit really showed its stuff. Wow! I'm not nervous to drive off-road like before. I'm very pleased with this design and how it functions.

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Reviewed by: Mike W from Arlington on 2/19/2017

2018 Ford F150 Limited

I searched for over a month to find out which Eaton differential was the correct one. The truck was so new no one listed it for a 2018 F150 Limited Twin Turbo. After a lot of research I thought I knew the correct unit. When I did the final search to get the unit Stage 3 had it listed for my model. I ordered it and though it would take a week or so to get it. It arrived in two days. Fast service for sure. I took the unit to the dealer I purchased the truck from and they installed it without any issues. Its quite and can't tell any difference from the open differential until you need it. Great product and Stage 3 has the best price.

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Reviewed by: Glen from SEALY, Texas on 1/21/2019

2015 F150 Supercrew 3.5L Ecoboost

This is the third Truetrac I've installed on an F150. I've had one on a 2002, a 2006 and now on a 2015 and every time I've installed one or had it installed, I've been happy with the performance and quality of the product. It's durable, trouble free and seamless in operation. The difference in traction in our Michigan winters is tremendous. This Truetrac is not different. My truck would lose traction on slippery surfaces when it rained or even if I stepped on the throttle too hard getting away from a corner. The traction control on the newer F150's works, but under slippery conditions it doesn't react fast enough nor does it help on ice. My experience with the Truetrac has been that without the Truetrac I go nowhere on ice, with it, I have traction to both rear wheels and a considerable increase in traction. I recommend this product without reservation.

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Reviewed by: John Bernardini from Michigan on 8/21/2019

2004 F150 9.75 diff

Easy to install, utilized same shims, perfect set up, and replacement, not afraid of winter, the traction is noticeable, have not had to use 4x4 yet! Quiet ride!

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Reviewed by: Robert Hopkins Jr from Montana on 12/17/2019

2016 Ford F-150 Ecoboost

This limited slip is awesome! I’ve never installed one before but after lots of research and taking my time I pulled it off. I’ve been driving around on it about 3 weeks and it hooks when you want it to and acts like an open dif when it should. Huge upgrade on the street and off road!

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Reviewed by: Ryan Scott from Rancho Cordova on 11/20/2019

17 Ford F-150 3.5 Ecoboost

I had my dealer install this differential and it great! The traction difference is amazing for the factory rear. I can’t wait to try it this winter. You don’t even know it’s a different rear until you need it!

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Reviewed by: Kurt P Beauchamp from Michigan on 7/13/2020

2011 F150

Highly satisfied. Works as described. Quality product.

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Reviewed by: Arthur Stuart from Pine Bluff, AR on 7/7/2018

2015 F150

5 ?? s !!!! Holly cow !!! Can’t believe I waited so long. Should have done this way sooner. Install wasn’t too bad (not a professional) luckily it “dropped” right in. So didn’t have to mess with backlash. Way better before I would get annoyed that only one tire would spin (even with baby35s) off-roading was just as bad as only one tire would spin before ABS intervene Also factory oem e locker disengages after 20/40 then at higher speeds you’re open diff But not with this 10/10 do it !!!!!!!!

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Reviewed by: Kurlos from Rear diff on 1/2/2022

2012 F150 XLT 4x4 Super Crew

I needed to rebuild the rear end because it was howling mostly on decell, turned out to be a bad carrier bearing. Truck was factory equipped with an open diff. Yuck! I did not want to rebuild it that way. Figured while in there do an upgrade. I love this diff, not overly obnoxious like an actual Detroit Locker would be but, there when you need it and no clutches to wear or require special friction modifiers. I would buy this item again in the future. All mechanical, no clutches or electronics. Just like God intended.

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Reviewed by: Jerry Frederick from Romulus on 6/23/2022

14 Screw 4*4 5.0

Nail it at a rolling right and it rips! Corners are much better, no more traction control cutout. Can pull my 7k lb trailer on wet grass in 2wd now. Worth the $$$ for the unit and install.

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Reviewed by: Meathead from Savannah, GA on 6/16/2020

2013 5.0 F150

You won't know it's even there - that is, till you stomp on it ! Before Eaton TruTrac it would spin then wheel hop. Now it just flat launches. Truck only has performance tune and K&N air filter. Stage 3 shipped right away. Only down side, box was destroyed when it arrived but no damage to parts. Get one! You will love it.

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Reviewed by: jimmy from Florida on 6/20/2020

2010 f150

Couldn't be happier with this differential. Ultra smooth on pavement yet good positive traction off-road. The transition between unlocked and locked is much smoother than what I would have expected also I went into a conventional 90w oil which is a lot cheaper than the synthetic with additive for the Ford clutch style limited slip.

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Reviewed by: Dallas Daaher from Guyton on 7/1/2020

Supercharged 2011 F150 Platinum 2WD 680 RWP

This differential launches straight and true every time!!!

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Reviewed by: Ronnie Seely from Odessa Texas on 3/30/2020

2019 F-150 Lariat PowerStroke 2WD

Good choice for me. In New Jersey, snow surface weather will be less challenging. I had an open diff. I did a test on gravel and it is absolutely working :-) Please include: MOTV-R975FRLBMK 11-20 F150 Motive 9.75" Rear End Master Install Kit - this will insure your installation is solid.

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Reviewed by: Steve A from Morristown, NJ on 10/8/2021

Is synthetic oil good for the Eaton Detroit 9.75-Inch TrueTrac Limited Slip Differential?

Asked by: Cedric Nobles - 12/21/2024

Yes you can use Synthetic oil in your differentials.

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Answer provided by: Joel Galaz (12/23/2024)

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Will your lsd work with 3.15 gears in 9.75 rear

Asked by: Mj - 11/16/2024

According to Eaton, this is compatible with all gear ratios.

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Answer provided by: Joel Galaz (11/18/2024)

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I have a 2011 F150 Lariat Limited 6.2L and a 9.75 axle. In other websites such as summit racing says this product doesn't fit my vehicle and your website does. Does this product really fit my vehicle?

Asked by: Frank - 9/7/2024

This will fit a non-raptor F150 with 9.75" rear end no problem. The only 9.75 F150 rear axle this won't work with is the Raptor, and that is due to the Raptor having 35 spline axles instead of the 34 spline that the non-raptor F150 have.

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Answer provided by: Joel Galaz (9/9/2024)

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Your Powertrax Grip Pro (GT109734) resembles the True Trac. It advertises a better warranty and is less expensive. Can please define the differences, pros and cons?

Asked by: Steve - 1/4/2024

Yukon uses a helical gear setup which is more capable than a clutch or spiral gear setups. Both are great options over the stock or clutch pack setups.

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Answer provided by: Joel Galaz (1/5/2024)

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I have a 2014 f150 stx sport 4x4 and it has the 9.75 rear end. if I have the 9.75 rear end does that also mean that my axles are 34 spline?

Asked by: betty ford - 6/22/2023

Yes the F150 standard trimmed F150 with the 9.75" rear end would have the 34 spline axles.

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Answer provided by: Joel Galaz (10/10/2023)

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Hi guys, will this fit my 2004 Ford Expedition? It has the 9.75 34-spline. The only difference from the F150 is that my Expedition has independent rear suspension, whereas the F150 has the live axle. Thanks

Asked by: John - 2/15/2023

Unfortunately, Eaton has not confirmed fitment on the Expeditions with a 9.75" IRS.

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Answer provided by: Jason@Stage3 (2/21/2023)

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When installing the trutrac which master install kit do you guys recommend? I see you have the Yukon master kit or the Motive kit there is certain price deference so does it matter or could you use anyone of the two master kit could work?

Asked by: 2013 f150 xlt 2wd - 2/13/2023

In general, we recommend using a Master Install Kit that matches whatever gears you're going to install. If you're going to be reinstalling the stock gears, you can really use either the Motive or the Yukon.

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Answer provided by: Jason@Stage3 (2/14/2023)

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I plan on swapping out the front diff of my 2018 F150 3.5 EB for a Truetrac (after I swap out the transfer case for a Raptor 4A), but I don't see a Truetrac for the 8.8 (912A563) for sale here. Do I need to go elsewhere?

Asked by: Daemon - 1/19/2023

The 912A563 TrueTrac will not fit a 2011-2023 F150. According to Eaton's Application guide, the 912A563 TrueTrac only fits the 28-spline IFS on 1997-2008 trucks. The 2011-2023 F150s use a 31-spline 8.8 IFS. 912A563 is not guaranteed to fit the 2011-2023 F150s, which is why we don't have it listed.

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Answer provided by: Jason@Stage3 (1/20/2023)

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Looking at the 913A477 for a 2012 Expedition with the 9.75 rear end. I was wondering if the fact that it has CV axles instead of a solid axle (because of the IRS) makes a difference on whether or not it fits. It seems that a lot of other replacement differential carriers are made to fit any 9.75 (including IRS Expeditions) but I wanted to confirm.

Asked by: Adam - 1/7/2023

Unfortunately, Eaton has not confirmed fitment on the IRS 9.75" rear ends on the Expeditions, and we have not done an install ourselves.

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Answer provided by: Jason@Stage3 (1/9/2023)

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Will this differential fit the 03+ Expeditions with the 9.75 IRS? The axles are 34 spline, but they're CV axles.

Asked by: Bryan - 10/12/2021

Unfortunately, we do not have a fitment confirmation on the 9.75" IRS Expeditions.

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Answer provided by: Jason@Stage3 (10/13/2021)

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Will unit 913A477 fit 2021 f150 with 3.5 ecoboost and max tow package (9.75" with 3/4 float axle)?

Asked by: Chris - 3/9/2021

Unfortunately, we do not have a fitment confirmation for any of the 2021 F150s as of yet. We'll hopefully have a confirmation one way or the other here soon.

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Answer provided by: Jason@Stage3 (3/10/2021)

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I asked my local Transmission shop about doing the install on this, in my 2017 F150. They said to get carrier bearings with this. Are those included or required?

Asked by: Chris - 2/9/2021

This part number only includes the differential. Bearings, shims, and hardware are not included. We generally recommend getting an entire Install Kit for installation of this differential, since you'll often have to re-shim to get the backlash correct, though your shop may already have shims on-hand. You can find our various install kits here.

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Answer provided by: Jason@Stage3 (2/10/2021)

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My 2016 F150 has a 6” lift and I’m running 22x12 on 35s. I currently have the e-locker and plan on installing a whipple supercharger in the future. Will it be worth upgrading to the true track and will it handle the horsepower of the whipple?

Asked by: Kurt - 1/16/2021

It may be worth it, if you don't mind giving up the selectable locking of the factory eLocker. The stock eLocker can't handle Whipple levels of horsepower and torque for very long, especially if you're doing a bunch of hard launches. The TrueTrac is much more capable of handling a Whipple than the stock eLocker. As long as you don't have an issue with being at the mercy of the TrueTrac's locking mechanism (which works very well in my experience) versus having a button to switch it on and off.

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Answer provided by: Jason@Stage3 (1/18/2021)

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What oil do you guys recommend I use with this unit?

Asked by: Mike - 11/14/2020

Any good synthetic 75W-140 that Ford recommends will work just fine. If you're installing gears and doing a 500-mile break-in, you'd be better off with whatever is cheap, since you'll be dumping that oil in pretty short order.

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Answer provided by: Jason@Stage3 (11/16/2020)

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How can I determine that my axle is 34 spine..

Asked by: Larry - 10/19/2020

That largely depends on your truck's model year or what axle you're using on your project. In general, the 1997-2020 F150 9.75" rear ends use 34-spline axles. However, there are more than one axle/rear end options for those model years, so you'll need to confirm before you order. Give us a call directly at 623-434-5277 or email us at [email protected] so we can get more specific about your truck.

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Answer provided by: Jason@Stage3 (10/20/2020)

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I have, 2018 ford f150 with, 9.75 gears 34 spline. Can i use the true trac in the front differential

Asked by: Greg - 10/8/2020

This particular part number will not fit the front differential of the 2018 F150s. The front differential is a 31-spine 8.8" IFS. While Eaton does have a TrueTrac that will work in that application, we tend not to recommend an LSD for the front differential, due to the traction control kicking in when it detects slip which makes the LSD questionably effective in most conditions. We generally recommend a locker of some sort for the front, but there's no reason why you couldn't do an LSD on the front. Just give us a call directly at 623-434-5277 or email us at [email protected] for possible options.

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Answer provided by: Jason@Stage3 (10/9/2020)

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I'm currently running a 5 Star tune in my 2019 2WD F150 3.5. Would upgrading to this differential require a re-tune?

Asked by: Michael - 5/28/2020

Nope. Installation of this differential does not require retuning. Just ensure that you have a 9.75" rear end before ordering.

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Answer provided by: Jason@Stage3 (5/29/2020)

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What is the warranty that is on the Detroit true trac?

Asked by: Blake - 5/1/2020

Eaton offers a 12-month limited warranty on their TrueTracs.

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Answer provided by: Jason@Stage3 (5/1/2020)

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I have a 2013 2wd drive xlt . Will this work and would it be worth it to grab the Yukon master install kit if I order this tru trac? How much is shipping to Hawaii ?please tell me you ship here I really want to put this in my truck. Thanks

Asked by: Lonz - 4/15/2020

This differential will fit a 2013 F150 RWD/2WD truck as long as it has a 9.75" rear end. Just keep in mind, that the 2009-2014 F150 RWD trucks could come with (and often did have) 8.8" rear ends, so verify your truck's rear end type before ordering. As for the Master Install Kit, we do recommend grabbing one for a couple of reasons: 1). You'll in all likelihood need to reshim for the new diff to get proper backlash, even if you're reusing the same ring and pinion. 2). It's really hard to not damage the bearings and races when doing a differential swap. 3). On a seven year old truck (at the time of this writing), it's probably a good idea to replace the seals anyway. We can ship to Hawaii. Give us a call directly at 623-434-5277 for a shipping quote.

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Answer provided by: Jason@Stage3 (4/16/2020)

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I use my 2018 F150 3.5L EB XLT 4x4 for day to day driving and the occasional drag race (on the strip...maybe) and I was looking at the TrueTrac as an alternative to launching in 4H. I don't use my e-lock and never will...it's useless for me. I want to be able to launch in 2WD without spinning out like crazy as it does in the default open diff. I have a feeling that launching in 4H might have some long term effects that might have me replacing my transfer case. So would the TrueTrac lock up when making turns during day to day driving causing really bad tire wear? Because the tires need to slip to make the turn, right? Or is there such thing as a high speed e-lock that would be a safer sub for launching in 4H?

Asked by: daemon9 - 3/16/2020

While the TrueTrac will help with your RWD launch, it won't be a perfect alternative/replacement for a 4-High launch. Having all four tires pulling your truck forward at launch will give you a better 60-ft time regardless of what rear differential you have. You are correct in that 4H launches aren't great for your transfer case, and the TrueTrac will help you if you switch over to RWD-only launches, but it's not the perfect replacement. As for turning, the thing you have to keep in mind is that the TrueTrac is an LSD, so it functions as an open differential during normal driving when the torque differential between the two rear wheels is low. Once that torque differential reaches a certain threshold (i.e. losing traction), the diff locks up and feeds power to both wheels until that differential torque falls.

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Answer provided by: Jason@Stage3 (3/17/2020)

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Are there any pros or cons to installing this in my truck if I tow a travel trailer. Trailer is about 4500 pounds dry. I will be doing a ring and pinion swap at the same time due to my 35 inch tires and 3.55 gearing. Any help would be appreciated.

Asked by: Al_Maryland - 2/20/2020

The TrueTrac would not really have an effect on towing. If anything, it may help you out in low-traction situations when you're loaded down. The only potential con I can think of is trying to get hitched up in a low-traction situation. The LSD could potentially lock when trying to reverse in dirt or on ice, which may make maneuvering to your hitch a little more annoying.

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Answer provided by: Jason@Stage3 (2/21/2020)

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Will this work on a 2015 Ford Expedition EL 4x4

Asked by: Jackc - 1/1/2020

Unfortunately, this differential is not guaranteed to fit a 2015 Expedition with a 9.75" IRS.

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Answer provided by: Jason@Stage3 (1/2/2020)

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Does this carrier need special carrier bearings or oem? If so do you have them available?

Asked by: Tyler - 12/26/2019

It does not need special bearings. The TrueTrac will work with OEM bearings and the OEM-replacement bearings found in most Master Install Kits or bearing kits.

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Answer provided by: Jason@Stage3 (12/27/2019)

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Have a 2018 F-150, 4x4 with the 3.55 open differential. Ordered the TrueTrac after speaking with a representative and looking at these q&a's. My rear end has 12 bolts. Took the TrueTrac and truck to the shop and my differential is a super 8.8 and the TrueTrac will not work. Ford changed these differentials to 12 bolts, so you need another way to identify them as the information you have/gave is incorrect. Please advise...

Asked by: Steve - 12/17/2019

The information we provided is correct for the 2004-2014 F150s, which used a 10-bolt 8.8" differential. The 2015-2020 F150s could come with either a 9.75" or Super 8.8" rear end. Unfortunately, the only way to tell the difference between the two is by differential housing shape. There is not currently a TrueTrac available for the 2015-2020 F150s with a Super 8.8" rear end.

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Answer provided by: Jason@Stage3 (12/17/2019)

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I’ve got an 02 fx4 with a 12 bolt rear. It’s got a shuttering issue due to what I’m assuming is the clutch packs. At 144k I’m considering dropping this in. What other parts will be needed for installation and can I expect better performance than the stock LSD?

Asked by: Brian - 10/18/2019

A master install kit that includes new bearings, seals, shims, and hardware. Your best bet would be to call us directly at 623-434-5277 so we can put together a complete package together.

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Answer provided by: Jason@Stage3 (10/21/2019)

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Does this come with new ring gear bolts?

Asked by: RLXXI - 10/3/2019

It does not. This part number is solely for the differential. We strongly recommend getting a Master Install Kit that includes ring gear bolts and other hardware for any differential install.

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Answer provided by: Jason@Stage3 (10/4/2019)

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will this tru track work on a ford 2001 expedition 5.4 2wd?

Asked by: crossfade - 9/22/2019

As long as your truck came with a 34-spline 9.75" rear end, then yes. Your issue is that the 2001 Expeditions could also come with an 8.8" rear end, so you'll need to verify your Expedition's rear end type before ordering.

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Answer provided by: Jason@Stage3 (9/23/2019)

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Will this fit in a 2008 F150 FX2? Axle code is B6 so it should be a 9.75" 3:73 LS.

Asked by: James - 7/28/2019

Your axle code does not dictate what axle you have, only the ratio and the differential. Your best bet would be to count the bolts on the rear axle to ensure you have a 9.75" on the 2008 trucks, the 9.75" have 12 bolts, while the 8.8" has 10 bolts.

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Answer provided by: Jason@Stage3 (7/29/2019)

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I have a 2013 F150 Lariat Super Crew 4x4. No off road package. How do I tell what my spline and axels are. Looked for tags on truck but no info.

Asked by: JC - 7/3/2019

Non-Raptor 2013 F150s could come with either a 9.75", 34-spline rear end or an 8.8" 31-spline year end. The easiest way to tell what rear end you have is that 9.75" 34-spline rear end has a 12-bolt cover with an oblong shape, while the 8.8" has a 10-bolt cover and more uniform shape. Your best bet is to count your cover bolts, though the majority of 4WD F150s from 2011-2014 came with 9.75" rear ends.

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Answer provided by: Jason@Stage3 (7/5/2019)

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Hi - I have a 2014 F150 2wd with the 9.75" rear end. I'm looking at adding a limited-slip differential. Would this LSD work, or do I have to have a pre-existing LSD to do the swap?

Asked by: Casey - 6/21/2019

You do not need an stock LSD in order to install this differential. This LSD can be installed in place of the factory open differential, stock LSD, or even the factory e-locker. Our only recommendation is that you grab at least a shim kit in order to install this LSD, if not a more extensive bearing kit.

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Answer provided by: Jason@Stage3 (6/24/2019)

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My 2018 F150 has the 9.75" rear, has 18,000 miles. Do I need anything else other than the LS differential.

Asked by: Joe - 6/1/2019

If you're only installing the differential, then you'd probably be fine with just a shim kit at that low of mileage. If you are installing gears along with the differential, then we do recommend grabbing an install kit that includes bearings and races, since it's pretty tough to not damage some of the OEM races and bearings (namely the pinion bearing and race) when removing them from the differential housing.

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Answer provided by: Jason@Stage3 (6/3/2019)

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Besides the rear. Can this also be put in the front?

Asked by: Garrett - 5/18/2019

It cannot. This TrueTrac will only fit the rear 9.75" rear ends of the 1997-2019 F150s, and will not fit the front 8.8" IFS. We also don't generally recommend using an LSD in the front, since you'll be kind of at its mercy when it engages/disengages, especially when adding steering input and the quirks of the F150's traction control system. It's a much better idea to put a selectable locker of some sort up front.

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Answer provided by: Jason@Stage3 (5/20/2019)

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I have 2017 f150 platinum. How can I tell if I have 9.75 or 8.8?

Asked by: Garrett - 5/1/2019

If your F150's rear end looks like this and has an oblong shape with the tapered side going toward the passenger's side of the truck, then you have a 9.75" rear end. If your truck's rear end is squared off with rounded corners, then you have a Super 8.8". If you need more assistance, please give us a call directly at 623-434-5277.

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Answer provided by: Jason@Stage3 (5/2/2019)

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What gear ratio will the trutrac 913A477 fit?

Asked by: Larry - 4/4/2019

According to Eaton, their TrueTrac will fit with any gear ratio.

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Answer provided by: Jason@Stage3 (4/5/2019)

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I have an 05 f150 crewcab 5.4 will this unit drop right in my 9.75 stock rearend or do I need extra parts? Thanks! any promotions coming up for this unit?

Asked by: Rick King - 3/26/2019

As long as your truck has a 9.75" rear end, this differential will fit. While you don't necessarily need extra parts and components, on an older truck with a good amount of miles on it, it's a very good idea to grab a 9.75" Master Install Kit to refresh the bearings, races, and shims both as preventative maintenance and because it can be pretty tough to keep the bearings in good shape during removal and reinstallation.

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Answer provided by: Jason@Stage3 (3/27/2019)

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will this unit just drop in my 05 f150 9.75 stock rearend or do i need other parts? how much would new pinion bearings be for this or do they come with it?

Asked by: Rick King - 3/26/2019

This part number does not come with a new pinion bearing. Individual bearings or a Master Install Kit will need to be purchased separately. Your best bet would be to call us directly at 623-434-5277 for the best pricing on a potential package deal.

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Answer provided by: Jason@Stage3 (3/27/2019)

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I have a 2018 Ford F150 XLT 2WD with 3.15 axle ratio....will this fit?

Asked by: CS - 3/4/2019

The 2018 F150s could come with either a 9.75" rear end or a Super 8.8" rear end. On a truck with RWD and a 3.15 ratio, you likely have a Super 8.8" and this differential will not fit. However, your truck could be equipped with either one. You'll need to verify your truck's rear end before ordering.

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Answer provided by: Jason@Stage3 (3/5/2019)

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How difficult is this to install in my 2018 F150 and what will it require?

Asked by: Carson Couch - 12/22/2018

Installation is fairly intensive and requires complete disassembly of your F150's rear end, checking backlash and gear engagement, and shimming properly to ensure operation.

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Answer provided by: Jason@Stage3 (12/28/2018)

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I have 2014 f150 3.5 eco with 3.31 open diff . I tend to off road alot nd was wanting this diff. Also was wanting to go to 3.73 . Would this application work ??

Asked by: Will - 9/5/2018

As long as your truck has a 9.75" rear end, this differential will fit and function in your truck, and should provide you an improvement in traction. Just keep in mind that 2014 F150s could come with either an 8.8" or 9.75" rear end, so please verify your rear end type before ordering.

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Answer provided by: Jason@Stage3 (9/6/2018)

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I have a 2012 F150 / r w d it has a tow package but I never pull trailers.Which differential would feel is best for my truck ?this is a work truck.>the Eaton Detroit True track or G2 Clutch type limit slip.

Asked by: Charles LaFrenie - 7/27/2018

The Eaton TrueTrac is a better all-around design than the G2 Clutch-type. The TrueTrac has quieter operation, faster locking, and doesn't wear like a clutch-type LSD. Clutch-type LSDs will require periodic rebuilds to replace their clutches, as well as friction modifier to ensure proper operation, which the TrueTrac does not. That being said, there's nothing wrong with the G2 differential, and it will work fine for your application, but the TrueTrac is simply a superior design.

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Answer provided by: Jason@Stage3 (7/31/2018)

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If I would install the true Trac in my 2015 f150 with a elocker is there a company that makes something to override the traction control for pcm would I get any codes?

Asked by: James - 7/21/2018

There's not a company that I'm aware of that makes a wiring blank for the stock E-Locker wiring. That being said, it's my understanding that you won't have issues unless you try to activate your E-locker with the knob with the TrueTrac installed.

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Answer provided by: Jason@Stage3 (7/24/2018)

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I have a 2013 F150 Supercrew Lariat w/tow package. No off road package. How do I found out what rear end, gear ratio I have? thanks

Asked by: Jason Corbin - 7/3/2018

Your driver's door information panel should have your F150's axle code which will tell you what gear ratio and differential your truck has stock. Figuring out whether you have a 9.75" or 8.8" rear end will require you to look at your differential. The 9.75" has 12 cover bolts and is an oblong shape with the passenger's side narrower than the driver's. The 8.8" has 10 cover bolts and a fairly symmetrical overall look. If you're still unsure, call us directly at 623-434-5277.

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Answer provided by: Jason@Stage3 (7/5/2018)

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I have a '17 F150 but it has the 8.8 rear, you got any TrueTrac for that or any news when there might be one?

Asked by: John - 5/12/2018

Unfortunately, Eaton does not have any differentials for the Super 8.8" trucks as of yet, and we have no information on and development. Yukon has confirmed fitment of the Ford Racing Traction-LOK LSD on the Super 8.8" trucks, though we do not have a confirmation of any other cross-fitments from the Super 8.8" Mustangs.

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Answer provided by: Jason@Stage3 (5/14/2018)

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I have a 2013 F150 4x4. I am considering upgrading rear diff to trutrac helical. Q1: Will this improve rear powered only driving traction and safety? Q2: For on-road it is safer than an open diff(or e-locker which acts like it when not engaged)? Last question Q3: what product is the e-locker for the front(considering for offroad/mud use)?

Asked by: Mr. G - 2/16/2018

1). In general, Eaton's TrueTrac provides a boost in traction to any truck running an open differential both on and off-road, but especially in slick conditions. 2). In wet, icy, or other adverse conditions, an LSD is generally safer than an open differential, though on an F150 with decent tires, the stock open differential combined with the truck's traction control does a more than adequate job of maintaining traction. 3). Eaton's eLocker that fits the Front 8.8 IFS is here.

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Answer provided by: Jason@Stage3 (2/20/2018)

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if i look up the part number on eatons website it says it will fit my 2005 fx4 however your listing says 11-17?

Asked by: ltl - 1/10/2018

Technically speaking, this differential will fit F150s from 1997 through 2017 with a 9.75" rear end with 34-spline axles. As long as your truck has a 9.75" rear end and 34-spline axles, this rear differential will fit.

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Answer provided by: Jason@Stage3 (1/11/2018)

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What is needed for installation on a 2018 Raptor regarding potential electronics issues from removing the OE e-locking differential?

Asked by: Matt - 1/9/2018

This differential will not fit 2017-2018 Raptors at all, due to the fact that Raptors have 35-spline axles, and this differential only fits 34-spline 9.75" rear ends. Unfortunately, Eaton does not currently have aftermarket rear differential options available for the 35-spline Raptors.

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Answer provided by: Jason@Stage3 (1/10/2018)

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Eaton makes a truetrac for the front 8.8". Can you get one, and will it be a good idea for the front? The truck is a daily driver. With winter highway driving and hunting.

Asked by: Joseph - 12/26/2017

We can get Eaton's 8.8" differentials, though we will need to know the year of your truck so we can get the right spline count. Whether it will be a good upgrade or not, we're not entirely sure. There's arguments both for and against it. A lot of folks say that running an LSD up front can be beneficial to off-road handling. However, we've also heard that because traction control/AdvanceTrac brakes when slip is detected that they're of limited utility. Still, we have not tried a front LSD setup ourselves, so we can't speak from experience on the matter. Give us a call directly at 623-434-5277 if you have more questions or so we can get more specific about your truck.

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Answer provided by: Jason@Stage3 (12/27/2017)

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How do we tell if we have the 8.8 or the 9.75? My axle code is 19 if that helps, which is 3.55 open diff. Thanks

Asked by: Justin Pietsch - 12/13/2017

The differentials look markedly different, for one, so if you look up images of both the 9.75" and 8.8" rear ends, you'll probably figure it out pretty quick. Secondly, the easiest way to tell is by counting the cover bolts. The 8.8" rear end has a 10-bolt cover, while the 9.75" has a 12-bolt cover. Also, if your truck is 4WD, then it most likely has a 9.75" rear end.

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Answer provided by: Jason@Stage3 (12/14/2017)

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Are all 2011 F150 5.0s 9.75 rear ends 34 spline?

Asked by: Justin - 12/9/2017

They are not. Some 2011 F150 5.0Ls came with an 8.8" rear end. Please verify your truck's rear differential before ordering.

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Answer provided by: Jason@Stage3 (12/11/2017)

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It’s mentioned in a previous answer to a question that a resistor is needed to terminate the e-locker wiring because of traction control issues. Can you explain what is needed as my ford dealership hasn’t a clue? I’d like to run the differential without traction control and stay locked at much higher speeds over the e-locker when needed.

Asked by: Roush - 10/8/2017

To be honest, we're not 100% sure what's required when going from the stock eLocker to an LSD or mechanical locker. We haven't done the conversion ourselves as of yet, though from what we've been told by Yukon and Eaton is that you do need to blank off the wiring in some form and fashion in order to avoid potential problems with traction control.

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Answer provided by: Jason@Stage3 (10/9/2017)

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2014 F150 FX4 Roush supercharged tuned to just over 500whp. Will this differential stay locked out of the dig and spin both tires with traction control disabled?

Asked by: Roush - 10/6/2017

This differential won't lock until the differential forces between the two axles, however, it should lock extremely fast in a drag racing application where you're seeing significant tire spin. If you're looking for a differential that will stay locked when you're in a straight line, then you may want to consider the Eaton Detroit Locker.

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Answer provided by: Jason@Stage3 (10/9/2017)

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Can I use the factory ring and pinion gear with this setup. I have a 2011 F150 Super crew with the 9.75" and factory 3.73 gearing? Thanks!!

Asked by: John - 8/4/2017

The TrueTrac will work with the factory gears and just about any stock-replacement ring-and-pinion gears.

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Answer provided by: Jason@Stage3 (8/7/2017)

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When will you guys be comming out with an lsd for the 8.8 rear end in the f150?

Asked by: Kyle - 7/23/2017

Eaton does not currently have an ETA for any LSDs or lockers for F150s equipped with the new Super 8.8" rear end.

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Answer provided by: Jason@Stage3 (7/24/2017)

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I have a 2016 4x4 XLT F150. I assume it has elock but to be honesty, with all the power I am pushing, elock or not it's not cutting it. I hardly off-road but I do love smokey TWO WHEEL burnouts. Trying to put as much power to the road as possible. For some reason just my passenger rear spins.. This makes me very sad. I am curious if this diff is what will solve my issue. What's your opinion guys?

Asked by: Pat - 7/17/2017

1). Unless you're able to pull out on your 4x4 selector and engage the eLocker, then your truck likely doesn't have an OEM locking differential. 2). This rear differential may not even fit your truck, due to the fact that most 2016 F150s actually came with the new Super 8.8" rear end. You'll need to be absolutely sure that your truck uses a 9.75" rear end. 3). If you do have a 9.75" rear end, this LSD may help to some extent, but your ability to do a burnout is more curtailed by your truck's traction and stability control systems than the rear diff, and ensuring that both Traction Control and AdvancedTrac are entirely disabled will likely help you more than a differential.

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Answer provided by: Jason@Stage3 (7/18/2017)

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Will this fit a 2015 Ford Transit 250?

Asked by: COOP - 5/30/2017

We're not familiar with the Transit Vans, but the 2015 250 models could come with a 9.75" rear end with 34-spline axles, and this LSD would fit. However, you need to verify your van's rear axle before ordering.

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Answer provided by: Jason@Stage3 (5/31/2017)

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I saw someone 8/16 asked about this truetrac for the 8.8. i was wonderi g if you guys had any updates on this yet? and also are all the 2015-2017 f150s 34 spline? whether its 8.8 or 9.75. Thanks

Asked by: Cy - 2/1/2017

The new Super 8.8" Rear End in the 2015-2017 F150s has 34 splines, meaning that both the newer (2011-2017) 9.75" and Super 8.8s use 34-spline axles. However, Eaton has not yet got back to us on an ETA for any new differentials for the Super 8.8s, unfortunately.

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Answer provided by: Jason@Stage3 (2/7/2017)

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My truck has the 9.75" rear end, and a 3.31 gear ratio with open differential. I run 35x12.50s. Would it be more beneficial for off roading to get this LSD, or regear to something like 4.10s? And is install of an LSD fairly easy?

Asked by: Tim Webber - 10/28/2016

It really depends on what kind of off-roading you're going to be doing, but in general, I'd argue that the LSD would be more beneficial on on truck with a factory open diff. Even with a stock ratio, having an improved traction mechanism would help immensely off-road. Regearing while you're doing the differential install wouldn't be a bad idea. Differential installs are fairly complex, and require you to remove the axles, properly shim, and adjust backlash on your gears to ensure no issues.

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Answer provided by: Jason@Stage3 (10/31/2016)

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I have a 2014 fx4 with a factory e-locker. Looking at upgrading gears in the future, is this something worth putting in? Or am I better off with the factory diff with upgraded gears?

Asked by: Geordi - 10/6/2016

It can be beneficial, but it really just depends on what you're doing with your truck, but in most cases. It probably isn't worth the cost on F150s with factory E-lockers. One of the biggest issues folks have with the stock E-locker is that it only stays locked to 20mph, which is only really helpful in slow low-traction applications. The TrueTrac will basically lock the rear axle whenever there's enough slip detected at any speed, which gives it a wider range of use in off-road applications. However, the TrueTrac is not user-selectable, which means you are a bit at its mercy. Still, the TrueTrac is a good choice if you are doing a lot of high-speed off-roading, but for most general F150 applications, though I'm not sure it's a worthwhile replacement for the E-Locker. You'll also need to plug the holes in the differential housing for the E-Locker wiring, and blank off the E-Locker body wiring with a resistor kit/custom wiring to avoid having issues with your truck's traction control.

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Answer provided by: Jason@Stage3 (10/7/2016)

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Is there any limited slip differentials available for the 34 spline Super 8.8 in the 2015+ F150?

Asked by: Greg - 8/26/2016

None that I know of as of yet. There are a few companies working on LSDs and lockers for the new Super 8.8" rear differentials, but I don't have an ETA on just about any of them, unfortunately.

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Answer provided by: Jason@Stage3 (8/29/2016)

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This differential is listed for 4WD but can it be used on a RWD 2013 F150?

Asked by: James Moshier - 8/16/2016

This LSD will also fit RWD F150s, as long as they have a 9.75" rear end with 34-spline axles. Please ensure that your truck does have a 9.75" before ordering, as some RWD F150s could come with an 8.8" rear end.

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Answer provided by: Jason@Stage3 (8/17/2016)

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Is this true with the Eaton Detroit True Trac LSD. If one wheel spins free, there is no power to the other wheel?

Asked by: Switch - 7/3/2016

That's not quite the case. Like most Limited Slip Differentials, the TrueTrac will allow some amount of slip where a single wheel can move freely, but once the difference in slip is too great, the LSD's gears will lock to ensure power delivery to both wheels.

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Answer provided by: Jason@Stage3 (7/6/2016)

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2011-2025 F150 4WD 9.75 inch S3M 4.11 Gear Package

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Yukon Gear Clutch-Type Positraction/LSD Friction Modifier

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1983-2014 F150 8.8 inch Powertrax Grip Pro Limited Slip Differential

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2011-2025 F150 9.75 inch Motive 3.55 Rear Gears

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2011-2025 F150 9.75 inch Motive 4.56 Rear End Gears

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1997-2025 Ford F150 Eaton Detroit TrueTrac Helical Gear Limited Slip Differential (9.75 inch 34-Spline) | 913A477

913A477

High-Performance Helical Gear Limited Slip Differential with Quiet Operation

Automatic Engagement with a Maintenance-Free Design

Is synthetic oil good for the Eaton Detroit 9.75-Inch TrueTrac Limited Slip Differential?

Will your lsd work with 3.15 gears in 9.75 rear

I have a 2011 F150 Lariat Limited 6.2L and a 9.75 axle. In other websites such as summit racing says this product doesn't fit my vehicle and your website does. Does this product really fit my vehicle?

Your Powertrax Grip Pro (GT109734) resembles the True Trac. It advertises a better warranty and is less expensive. Can please define the differences, pros and cons?

I have a 2014 f150 stx sport 4x4 and it has the 9.75 rear end. if I have the 9.75 rear end does that also mean that my axles are 34 spline?

Hi guys, will this fit my 2004 Ford Expedition? It has the 9.75 34-spline. The only difference from the F150 is that my Expedition has independent rear suspension, whereas the F150 has the live axle. Thanks

When installing the trutrac which master install kit do you guys recommend? I see you have the Yukon master kit or the Motive kit there is certain price deference so does it matter or could you use anyone of the two master kit could work?

I plan on swapping out the front diff of my 2018 F150 3.5 EB for a Truetrac (after I swap out the transfer case for a Raptor 4A), but I don't see a Truetrac for the 8.8 (912A563) for sale here. Do I need to go elsewhere?

Will this differential fit the 03+ Expeditions with the 9.75 IRS? The axles are 34 spline, but they're CV axles.

Will unit 913A477 fit 2021 f150 with 3.5 ecoboost and max tow package (9.75" with 3/4 float axle)?

I asked my local Transmission shop about doing the install on this, in my 2017 F150. They said to get carrier bearings with this. Are those included or required?

My 2016 F150 has a 6” lift and I’m running 22x12 on 35s. I currently have the e-locker and plan on installing a whipple supercharger in the future. Will it be worth upgrading to the true track and will it handle the horsepower of the whipple?

What oil do you guys recommend I use with this unit?

How can I determine that my axle is 34 spine..

I have, 2018 ford f150 with, 9.75 gears 34 spline. Can i use the true trac in the front differential

I'm currently running a 5 Star tune in my 2019 2WD F150 3.5. Would upgrading to this differential require a re-tune?

What is the warranty that is on the Detroit true trac?

I have a 2013 2wd drive xlt . Will this work and would it be worth it to grab the Yukon master install kit if I order this tru trac? How much is shipping to Hawaii ?please tell me you ship here I really want to put this in my truck. Thanks

Are there any pros or cons to installing this in my truck if I tow a travel trailer. Trailer is about 4500 pounds dry. I will be doing a ring and pinion swap at the same time due to my 35 inch tires and 3.55 gearing. Any help would be appreciated.

Will this work on a 2015 Ford Expedition EL 4x4

Does this carrier need special carrier bearings or oem? If so do you have them available?

I’ve got an 02 fx4 with a 12 bolt rear. It’s got a shuttering issue due to what I’m assuming is the clutch packs. At 144k I’m considering dropping this in. What other parts will be needed for installation and can I expect better performance than the stock LSD?

Does this come with new ring gear bolts?

will this tru track work on a ford 2001 expedition 5.4 2wd?

Will this fit in a 2008 F150 FX2? Axle code is B6 so it should be a 9.75" 3:73 LS.

I have a 2013 F150 Lariat Super Crew 4x4. No off road package. How do I tell what my spline and axels are. Looked for tags on truck but no info.

Hi - I have a 2014 F150 2wd with the 9.75" rear end. I'm looking at adding a limited-slip differential. Would this LSD work, or do I have to have a pre-existing LSD to do the swap?

My 2018 F150 has the 9.75" rear, has 18,000 miles. Do I need anything else other than the LS differential.

Besides the rear. Can this also be put in the front?

I have 2017 f150 platinum. How can I tell if I have 9.75 or 8.8?

What gear ratio will the trutrac 913A477 fit?

I have an 05 f150 crewcab 5.4 will this unit drop right in my 9.75 stock rearend or do I need extra parts? Thanks! any promotions coming up for this unit?

will this unit just drop in my 05 f150 9.75 stock rearend or do i need other parts? how much would new pinion bearings be for this or do they come with it?

I have a 2018 Ford F150 XLT 2WD with 3.15 axle ratio....will this fit?

How difficult is this to install in my 2018 F150 and what will it require?

I have 2014 f150 3.5 eco with 3.31 open diff . I tend to off road alot nd was wanting this diff. Also was wanting to go to 3.73 . Would this application work ??

I have a 2012 F150 / r w d it has a tow package but I never pull trailers.Which differential would feel is best for my truck ?this is a work truck.>the Eaton Detroit True track or G2 Clutch type limit slip.

If I would install the true Trac in my 2015 f150 with a elocker is there a company that makes something to override the traction control for pcm would I get any codes?

I have a 2013 F150 Supercrew Lariat w/tow package. No off road package. How do I found out what rear end, gear ratio I have? thanks

I have a '17 F150 but it has the 8.8 rear, you got any TrueTrac for that or any news when there might be one?

if i look up the part number on eatons website it says it will fit my 2005 fx4 however your listing says 11-17?

What is needed for installation on a 2018 Raptor regarding potential electronics issues from removing the OE e-locking differential?

Eaton makes a truetrac for the front 8.8". Can you get one, and will it be a good idea for the front? The truck is a daily driver. With winter highway driving and hunting.

How do we tell if we have the 8.8 or the 9.75? My axle code is 19 if that helps, which is 3.55 open diff. Thanks

Are all 2011 F150 5.0s 9.75 rear ends 34 spline?

2014 F150 FX4 Roush supercharged tuned to just over 500whp. Will this differential stay locked out of the dig and spin both tires with traction control disabled?

Can I use the factory ring and pinion gear with this setup. I have a 2011 F150 Super crew with the 9.75" and factory 3.73 gearing? Thanks!!

When will you guys be comming out with an lsd for the 8.8 rear end in the f150?

Will this fit a 2015 Ford Transit 250?

I saw someone 8/16 asked about this truetrac for the 8.8. i was wonderi g if you guys had any updates on this yet? and also are all the 2015-2017 f150s 34 spline? whether its 8.8 or 9.75. Thanks

My truck has the 9.75" rear end, and a 3.31 gear ratio with open differential. I run 35x12.50s. Would it be more beneficial for off roading to get this LSD, or regear to something like 4.10s? And is install of an LSD fairly easy?

I have a 2014 fx4 with a factory e-locker. Looking at upgrading gears in the future, is this something worth putting in? Or am I better off with the factory diff with upgraded gears?

Is there any limited slip differentials available for the 34 spline Super 8.8 in the 2015+ F150?

This differential is listed for 4WD but can it be used on a RWD 2013 F150?

Is this true with the Eaton Detroit True Trac LSD. If one wheel spins free, there is no power to the other wheel?

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