2015-2020 F150 Auto Spring Rear Add-a-Leaf Kit AS15015AAL

15-20 F150 Auto Spring Rear Add-a-Leaf Kit

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Part#:

AS15015AAL

25 Review(s) Write a Review

67 Customer Q&A(s)

$256.25

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Product Features
25 Customer Review(s)
67 Q&A(s)

Highlights:

Add rear ride height and improve carrying capacity
Includes two high-strength steel leafs with adapter pins
Adds 1.5" of rear ride height after settling
Great for towing applications on leveled or lifted trucks
Drop right into the factory leaf packs
Can reuse stock U-bolts

Increase Rear Ride Height and Towing Capacity for your F150

2015-2020 F150s that do some serious towing or hauling are going to need more than a standard rear block in order to get the job done, and Auto Spring is here to help with their high-quality Add-a-Leaf kit for the 2015-2020 F150s. This pair of leaf springs install directly into your F150's stock leaf pack without any drilling, cutting or trimming, and add up to 950lbs of load support to your truck. The F150 Auto Spring Add-a-Leafs are also capable of increasing rear ride height by up to 1.5" to 2", giving your truck an aggressive look while helping keep your F150 level when you're towing or hauling all of your gear. The Auto Spring Add-a-Leaf Kit are perfect compliments to 2" leveling kits or coilovers, giving your F150 a mean look while letting you fit on proper-sized off-road tires.

High-Strength Leaf Springs That Reuse the Stock U-Bolts

Each one Auto Spring's F150 Add-a-Leaf Kits comes with a pair of high-quality leaf springs, new pins, and installation instructions. The springs are manufactured out of extremely strong, US-sourced 5160 tempered spring steel that allows them to hold up to just about any application that you have in mind. The springs also have Teflon pads on each end which reduce NVH and help prevent squeaking during break-in. The springs install directly into your F150's factory leaf pack and are completely compatible with your F150's factory U-bolts and rear shocks for most applications. Auto Spring includes a set of four new Grade 5 adapter pins for installation.

Stage 3 Shield Canada Flat Rate Shipping to Canada! Call 623-434-5277!
We here at Stage 3 love and appreciate all of our Canadian customers. What we don't love is charging an arm, a leg, and maybe a kidney for shipping across the imaginary line up North. The good news is that we can ship this Auto Spring Kit to Canada for the low rate of $75! Just call us at 623-434-5277 to take advantage of this deal!

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2015 F150

After placement of the 'add-a-leaf', the stock u-bolts were not long enough to allow for a full nut's length of thread. Both I and the Ford Dealership, doing the installation, agreed that this was not as safe as it should be; a full length minimum should be required to avoid any undo stress on the threads holding the spring assembly onto the axle. Longer u-bolts, not provided in the Stage-3 Add-a-Leaf kit, were obtained and used to complete the installation.

Did you find this helpful? 28 of 32 Found Helpful

Reviewed by: JD Smith from Cedar Creek, TX on 11/17/2017

2015 F-150 XLT

I have a capper, wood bench, extra battery etc...always in the truck, so with a full load it really starts to sag, or when towing, especially with my leveled front. I wanted to get rid of my sag and get some extra weight capacity and ended up giving this a try. First, it raised my back end about 1 3/4-2 inches, so I have a bit of the factory rake back. Second, I can have a full load in the back without sag. The ride isn't any worse than before, no bounce in the back. It's over 40 inches in length so it isn't some tiny spring that makes the ride rough..I would buy it again without hesitation.

Did you find this helpful? 23 of 23 Found Helpful

Reviewed by: LL33 from Raleigh NC on 4/10/2016

2016 F150 SuperCrew

Install time was 3 hours including jacking and supporting vehicle and locating tools. I installed the leaf after installing 2.5 front leveling kit. The front leveling kit after alignment gave .5 lift to the rear. After the add a leaf I gained 1. Truck looks and drives amazing, not rough at all !!

Did you find this helpful? 14 of 15 Found Helpful

Reviewed by: David from KEY LARGO on 2/13/2018

2.7l F-150 super crew FX4

Very easy to install (with car lift), I had an issue with squat do to carrying my RTT w/ bed rack, drawer system, fridge w/ fridge slide, 100ah Deep cycle AGM batt, camp stove....etc. these remedied that quick, gain my body clearance back. Would recommend these over helper springs.

Did you find this helpful? 12 of 12 Found Helpful

Reviewed by: Chris from Nevada on 11/29/2017

2015 F150

This is just what I was looking for. I installed the Rancho Quick Lift Loaded combo on the front to level my truck but I was not satisfied with the look. Instead of installing an airbag suspension on the back like my previous truck in went with these and so far I am very happy with my decision. Install was a breeze and had no issues.

Did you find this helpful? 8 of 8 Found Helpful

Reviewed by: Jon E from Pennsylvania on 11/10/2016

2019 F150 FX4

Cannot comment on the install, strictly because $200 for 4wheelparts to install was cheaper than me dragging the jack out of the garage. Previously I had leveled the truck with 5100's. When I towed my 5k lb trailer I would have 2" sag in the rear. I decided to upgrade to a 10k lb trailer and knew I needed the help. As you can see from the picture, these things rock! I picked up just shy of 2" in the rear after install. To address the ride.... Shut up. You want a Cadillac, go get one. Its a truck. To say the ride is "slightly" more chopper would be a stretch. I will take the ride over looking like an idiot going down the road with my rear bumper dragging the road with a load on it.

15-20 F150 Auto Spring Rear Add-a-Leaf Kit Review Image!

Did you find this helpful? 8 of 8 Found Helpful

Reviewed by: Ray from ATL on 7/31/2019

2017 f150 2.7

I had installed fox 2.0 coilovers on my truck for about 1.75' of lift leaving the rear nearly an inch higher than the front. A leer topper and 20k miles later the rear factory 1.5' block had allowed the back of the truck so sag nearly level with the front. Load some wood or gear in the back and the truck would go nose high and even hit the rear bump stops on rough surfaces. I decided to grab these AAL's and give them a try. I removed the factory block and put these in their place. The rear is back to an inch rake over the front and the ride is so much better! Possibly a little firmer ride but not harsh in any way and handling is much improved. If I ever buy a new f150 I will immediately remove the factory block and put these in. Not one complaint, easy install and a quality product that's worth the money. Took about two hours in my garage. If you put as much as a golden retriever in the bed of your truck you need these!

Did you find this helpful? 7 of 8 Found Helpful

Reviewed by: Wesley Bierma from Durango, CO on 11/19/2018

Ford F-150 2018

Excellent product and did exactly what was advertised. I hauled 1,500 lb. to 2,000 lb. pallets across town about 20 times recently and afterward I noticed my truck had permanently sunk 1.5. I bought this product to increase the hauling capacity and to get the lift back and it worked perfectly. I had a local company do the installation and they had no problems at all. It might be difficult to see the lift difference in the before and after pics because its only 1.5 , but its there if you look close enough. And I could tell immediately in person. I like knowing that I have that extra hauling capacity. I noticed no difference in the ride quality after installation. Thank you!

Did you find this helpful? 6 of 6 Found Helpful

Reviewed by: Ryan from Grandville on 10/10/2018

2015 Ford F150

Product helped level my truck when hooked up to my 5th wheel trailer. Ride quality did not suffer and installation was a breeze.

Did you find this helpful? 5 of 5 Found Helpful

Reviewed by: Scott from Osoyoos B.C. on 9/26/2016

2018 F150

I have a 2018 F150 XLT. I purchased the truck and immediately installed a 2.5” front leveling kit. This set my truck within a 1/4” of perfect level. When towing a UTV my truck would squat significantly in the rear. I started looking for options to maintain the desired stance. After reading reviews I decided to purchase the add a leafs. I installed the add a leafs my self using jacks and jack stands. It took me about an hour. While installing I removed the factory blocks(1.25” blocks) and this set my truck right at 40” in the rear. This gives my truck a 3/4” rake and increasing the rear height by 1/2”. The ride quality hasn’t suffered much. You can feel a little stiffer ride but only slightly. The increased stabilization while towing is worth the slight stiffness in the ride. At 4000 miles in I’m very pleased.

Did you find this helpful? 5 of 5 Found Helpful

Reviewed by: GR Cobbs from Shreveport, La on 8/22/2019

2018 F150

These springs did exactly what I hoped for. Raised rear end up 1 1/2 and she doesn't sag when putting 200 lbs. in bed.

Did you find this helpful? 3 of 3 Found Helpful

Reviewed by: Clark from Pa on 3/15/2018

2015 Ford F-150

Great Product, perfect fit, easy installation Recommended AAA+

Did you find this helpful? 3 of 3 Found Helpful

Reviewed by: David S. from Ecuador on 5/10/2018

2017 F150 Ecoboost Supercab 4x4

After installing my Bilstein 5100 Leveling kit at the second from highest setting, the truck would squat with barely any weight in the bed (2.7l eco). I carry a deep tool box with about 200lbs of tools at all times and it felt like the truck was back heavy. Once I installed the leaf (left stock blocks in) the truck almost has a stock rake back, rides better, handles weight better, and tows better.

Did you find this helpful? 3 of 3 Found Helpful

Reviewed by: Shaun T from Lehigh Valley Pa on 3/9/2019

2017 F-150 Crew Cab FX4

Added the perfect amount of lift to my truck and compensated for the extra weight of the Leer Cap I added. The Fox 2.0+the leer were a little too much to keep the truck level, so this provided a small amount of rake now that it has settled out. The only thing that would make this kit better would be included U-bolts for the application as I felt they could have been a little longer.

Did you find this helpful? 2 of 2 Found Helpful

Reviewed by: Matt from New Orleans, LA on 4/25/2019

2015 f150 crewcab

Install was easy, also installed new skyjacker shocks eliminated my axle wrap problem while towing. Also truck rides smoother then new to my surprise. I have also 2.5 level kit in the front truck sit nice when new but after 40,000 miles and lots of hulling and towing rear was starting to sag, these make it sit perfect thanks

Did you find this helpful? 2 of 2 Found Helpful

Reviewed by: Paul from Northern cambria pa on 10/26/2018

2017 F150

easy install with a lift and a couple of clamps. lifted the rear just enough to provide some slight rake when towing and doesn't feel that much stiffer.

Did you find this helpful? 2 of 2 Found Helpful

Reviewed by: Ryan from Alabama on 2/25/2018

2017 F150

Super east install, raised the rear end just like it was supposed to. No negative driving impacts noticed.

Did you find this helpful? 1 of 1 Found Helpful

Reviewed by: Andy from San Diego on 9/7/2019

2015 F150 Lariat 4x4

Works great, leveled my truck out perfect. I have a fiberglass topper on the back that made a difference in the stance, she now has the stance of a real truck with the add a leaf. Can't really tell a difference in the ride quality either, still rides great. Took about 4 hours to do both sides with no power tools. Pretty easy job.

Did you find this helpful? 1 of 1 Found Helpful

Reviewed by: Isaiah from Clarksville on 1/18/2020

2018 F150

These springs were great quality. Install was straight forward. I YouTube’d the install. They recommend using some hand clamps to hold the spring pack together while assembling. Good trick. Lifted the rear and of my truck 2” when all said and done.

Did you find this helpful? 1 of 1 Found Helpful

Reviewed by: Josh Nichols from Washington State on 8/13/2020

2018 Ford F150 4WD

This item is supposed to raise the rear end of your truck 1.5-2". After installing these leaf springs and a 2.7" lift to the front, my ride went from a 1.5" rake to a 1.25" squat ... meaning the rear end was lifted a whopping 0.05 inches. Additionally, the whole point of add-a-leaf springs is to prevent sag under load. Unloaded, there was 1.5" is space between the bottom of my Timbren SES and its base plate. After loading half a cord of wood, there was no more space in the SES. As far as I can tell, these leaves have done absolutely nothing for my truck's suspension. The only good thing I can say is that they're heavy steel. Unfortunately, they are also difficult to install, since you have to take your existing spring pack apart to install these leaves right above the bottom leaf in the factory spring pack. This product is not even close to the performance and convenience of Hellwig's Helper Springs and are actually more expensive. I wish I had found out about the Hellwig springs before I bought these add-a-leaf springs.

Did you find this helpful? 1 of 11 Found Helpful

Reviewed by: Ted M. from GREENFIELD on 5/17/2020

17 5.0

For the price point these leafs are super legit. Install per side is 30 minutes tops if you're mechanically inclined. I installed them and immediately towed 9k on stock shocks with no squat with 2" leveling pucks (previously installed before leafs) Before the Add a leaf, I had 2" leveling puck making full level no factory rake. After the add a leaf settled it return to factory like rake with the 2" leveling puck still installed, so if you're going to install these with no leveling or other suspension work, your rake is going to be utterly ridiculous.

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Reviewed by: S. Kovax from Texas on 12/23/2020

2019 F150

Simple to install only took 2 hours.

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Reviewed by: Paul from indianapolis on 3/28/2020

2017 F150

Great add to my truck and made a huge difference.

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Reviewed by: Kevin Tavares from Atlanta on 8/13/2018

2015 F 150

They did exactly as they should. Lifted the back up about 1 1/2" and increased payload. They stiffened the ride quite a bit more than I would desire but hopefully they will break in.

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Reviewed by: Cole from AZ on 7/17/2019

F150

Easy installation. Lifted about 1-1.5” in ride height. Ride not stiff.

Did you find this helpful? 0 of 1 Found Helpful

Reviewed by: Robert Klingaman from Temecula, CA on 6/19/2019

Will these work on a 2018 Ford Raptor?

Asked by: Dave - 4/11/2018

They will not. The 2017-2018 Raptors have an entirely different leaf pack than the standard F150s.

Was this answer helpful? 4 of 4 Found Helpful.

Answer provided by: [email protected] (4/11/2018)

2015-2020 F150 Auto Spring Rear Add-a-Leaf Kit AS15015AAL

AS15015AAL

Increase Rear Ride Height and Towing Capacity for your F150

High-Strength Leaf Springs That Reuse the Stock U-Bolts

Will these work on a 2018 Ford Raptor?

Would getting the rear add a leaf require something for a stock front end? I.e. Lift or level?

What would be the pros and cons of doing the add a spring over a taller block?

Hi, I installed the Readylift 69-2300 3.5" lift kit and 2" block in rear. Taht Block is 3" but Lift the truck only 2" when reemplaced stock. The question is: I want to go up an inch more and I think with this I will achieve it but I will have to buy some spacer for the Driveshaft or not?

What's the average hight these are getting? And is there an option to were I can only get one inch? Thanks!!

Will I need to replace my factory shocks with longer travel shocks with the addition of the add-a-leaf kit?

Hi, I am planning on purchasing a 2017 f150 soon. I would like to have it level with the rancho quicklifts in the front. Can these be ran with the factory 1.5 blocks removed on the rear so that I would still maintain a level stance if towing? Thanks

I see a review mentioning the stock bolts are not long enough, has this issue been fixed? Can you add longer bolts prior to shipping?

I'm looking to add this AAL kit as well as install Bilstein shocks. With the 5100 being rated for 0-1" of lift, do I need to step up to the 5160 on the rear?

Can I run these with fabtech 6in lift blocks and still grab another 1.5-2in of lift?

Will this add a leaf kit fit a 2018 ford raptor?

I have a 2019 F150 how thick is this spring? Will I need longer U-bolts?

How long is the break in period for the AAL to settle to 1.5” of raised height? Also, I’m getting a 2.5” Mammoth level installed on the front of my ‘16 F150, will this combo level me out or leave some rake? (I don’t want any squatting)

if adding the leaf kit do I need to use longer ubolt on a 2015 f150 lariat?

If using an Add a Leaf, are there any recommendations to maintain the factory pinion angle, or is a shim included to remedy this?

Will these work with the Boss Ultimate kit since the Boss can only accommodate 1.5" of lift and these can be between 1.5 and 2"? if not, what do you recommend for rear shocks?

Can lift my truck 4" and still put these leaf springs in?

Hi I just bought a 2017 F150. The dealer added a level kit in the front (strut spacer) and it looks like it needs about an inch or so lift on the rear. Does this spring fit a 2017? If so how will it perform with the factory shocks?

Can I add this to my 2016 fx4 along with the BDS 4" or 6" lift kit?

what did this add a leaf do to the ride quality of your 3.5l ecoboost you installed it on... was it smoother?

Hi I have a 2016 f-150 2.7 ecoboost will this kit fit? I bought a ready lift add a leaf that said it would fit my truck but from the bolt hole to the end of the add a leaf was too long to fit my oem leaf pack because the are brackets holding the leaf packs together will your kit fit?

I am planning on adding the Fox 2.0 Leveling coilover kit to my 18 F-150 FX4. I'd like to maintain a slightly taller rear for when I do tow and haul cargo. Would this work alright with that combination?

on a 2018 f150, what is the recommended shock if installing an add-a-leaf kit?

Is there a specific torque and order to re install?

I'm running the ready lift 3.5" SST lift in my 17 f150, will running this add a leaf give me any problems with shocks or drive shaft angles?

What is the weight capacity rating for the add a leaf? For example, 1000, 2000 lbs.

If I ditch the factory 1.25" block on my 2016 SCREW FX4 and replace with this AAL, how much lift should I go with on adjustable coilovers to achieve approximately .75" of rake?

I have a 2015 F'150 157"WB 4x4 and recently installed the "2015-2018 F150 Stage 3 BOSS Trail Suspension Pack 2" kit on my truck to gain some extra ride height. Would I be able to install this AAL kit with the 3" blocks and shocks that were included on this kit without issue?

I have a 6” BDS lift can this be added to the truck to give me more lift for carrying?

Will these work well with the Bilstein shocks on a leveled FX4 2015?

I have a 2018 F150 with a 7" Readylift kit with the adjustable Bilstein shocks in the front and fox shocks in the rear. My question is will I need to get a bigger spacer for the drive shaft and is their anything else I will need?

I’m looking to stiffen up the rear of my 2018 F150, but only want 0-1in of life. Can the stock rear blocks be removed while installing these to reduce the amount of lift these springs normally provide? If so, what is the net lift when removing the stock blocks? Thanks!

I have 2017 F150 FX4. I just purchased the Eibach complete pro-truck sport shock & strut kit with the pro-lift coil springs. Will I need to remove the factory 1.5” block for these leaf springs to make my truck stance level or replace with a smaller block?

with an air ride 5000 on board already if I add the AAL how much more tongue weight and overall weight would my 2015 F150 4wd with 2,7 ecoboost be able to pull. I'm currently t 601 tongue and 8500 max load

will this part fit a 2018 Ford Raptor super crew (4 door) truck?

Can the add a spring be used on a Raptor?

for a 2015 F150, 2WD XLT with a towing package, is there a rough estimate of how much added payload capacity I'll get with this kit? I've been hauling a lot of paver stones, decomposed gravel, etc. and could use a few hundred pounds extra capacity.

Is this compatible with a 2019 Ford Raptor?

Will the hellwig 0-2" lift sway bar still work if i have this add-a-leaf installed?

Do you stock an add a leaf for 2017 ford raptor? For towing and ride height. Thanks Todd

How much stiffer it's gonna be? Will any improvement if I upgrade to Bilstein 5100 shock at the same time?

I have a 2inch leveling kit on my 2019 f150 and I would like to start towing a travel trailer. Would add a leaf help with rear squatting?

Not sure what direction I want to go on the suspension for my 2019 Raptor. Its currently leveled with a icon collar kit and now the rear sags. Can I use this or something similar to get the rear end up in the mean time while deciding what full kit I want to do?

Will these work with a roadmaster active suspension also or something like super springs?

Doing an add a leaf do I need to do any spacing for the driveshaft or is it fine as is?

Would this work with the 15-20 4WD Bilstein 6112 Stage 2 Suspension Package BIL6112S2?

Will the bilstein 5200 rear shocks work with this?

Any reports or feedback that this AAL eliminates "axle wrap/wheel hop" or the vibration/shakiness caused by the soft oem leafers?

I currently have a BDS 4" lift on F150 XLT 4WD. It has 4" rear blocks. When towing, even with the weight distribution hitch, i'm getting sag. What combination of reduced block size and this AAL kit would keep the ride height the same/similar unloaded and also prevent sag while towing.

Is the add a leaf designed to be installed with the factory block still in place, or with the removal of the stock block?

Having problems finding add a leaf for a 2017 f150 4x4 with max tow package, looking for answers

Would these work if i wanted to eliminate the stock block in the rear?

I have a 2020 f150 lariat 3.5 ecoboost 4x4. How much payload capacity would i gain on my truck?

I have a 2015 Ford F150 Platinum 4wd and just added a leer topper with rack. The truck has a 2.5 leveling kit but I have noticed slight lowering in the rear, maybe 0.5 - 0.75 inches. would this essentially relevel the truck and possibly give it a little rake? Thanks

Do these require longer u bolts? If so do you have the longer bolts in stock?

I have a friend that installed the AutoSpring Add a Leaf and once it settled it settled down .75” on the left and 1” on the right. Is that uncommon? With a stock block and stock tire size it’s sitting at 40” ground to fender on the left and 40.25” ground to fender on the right.

Are the rear shocks in the 2014-2020 F150 4WD FOX 2.0 Stage 1 Suspension Package FOX-14STAGE14WD be compatible with these aal? I haul a heavy trailer, and want to reduce the rear sag as much as possible. Really just want 1" of rear lift, but not sure blocks are the way to go.

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