1997-2023 F150 Eaton Detroit TrueTrac Helical Gear Limited Slip Differential (9.75" 34-Spline) 913A477

97-23 F150 9.75' Eaton TrueTrac Limited Slip Differential

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Part#:

913A477

17 Review(s) Write a Review

56 Customer Q&A(s)

$774.99

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Product Features
17 Customer Review(s)
56 Q&A(s)

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 2022 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 1997-2020 F150s with 9.75" rear ends and 34-spline axles.

1997-2022 F150s only: this differential only fits Ford 9.75" rear ends with 34-spline axles, like those found on 1997 to 2022 F150s.

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

Write a Review

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)

Did you find this helpful? 33 of 34 Found Helpful

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

2019 f-150 RCSB

picture is worth a thousand words

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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.

Did you find this helpful? 11 of 11 Found Helpful

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.

Did you find this helpful? 10 of 11 Found Helpful

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.

Did you find this helpful? 8 of 8 Found Helpful

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

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!

Did you find this helpful? 8 of 8 Found Helpful

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

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.

Did you find this helpful? 7 of 7 Found Helpful

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

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!

Did you find this helpful? 5 of 5 Found Helpful

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!

Did you find this helpful? 4 of 4 Found Helpful

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

2011 F150

Highly satisfied. Works as described. Quality product.

Did you find this helpful? 3 of 3 Found Helpful

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 !!!!!!!!

Did you find this helpful? 2 of 2 Found Helpful

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

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

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

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.

Did you find this helpful? 1 of 1 Found Helpful

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.

Did you find this helpful? 1 of 1 Found Helpful

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

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.

Did you find this helpful? 1 of 1 Found Helpful

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

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 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.

Was this answer helpful? 8 of 8 Found Helpful.

Answer provided by: [email protected] (7/6/2016)

1997-2023 F150 Eaton Detroit TrueTrac Helical Gear Limited Slip Differential (9.75" 34-Spline) 913A477

913A477

High-Performance Helical Gear Limited Slip Differential with Quiet Operation

Automatic Engagement with a Maintenance-Free Design

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

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?

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!!

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?

Does this come with new ring gear bolts?

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

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

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?

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

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

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?

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

Will this fit a 2015 Ford Transit 250?

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

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

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.

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

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?

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

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 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.

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 ??

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

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

What gear ratio will the trutrac 913A477 fit?

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

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

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

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?

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.

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

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

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

Will this work on a 2015 Ford Expedition EL 4x4

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.

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

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

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

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

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

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

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?

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?

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

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

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?

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

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