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SR Performance 8.8 Axles - 31 Spline 5 Lug (05-14 GT; 11-14 V6; 07-09 GT500)

Item 525038
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      Review & Installation Video

      Hey guys, I'm Alex from, and today I'm bringing you my quick review and breakdown of the SR Performance 31 Spline 5 Lug Axles, fitting the '05 through '14 GT, '11 though '14 V6, and '07 through '09 GT500. So in this video, I'm gonna give a quick overview on who these axles are going to appeal to, the construction and materials utilized here, the price, and then what it's gonna take to get these onto your Mustang, where I'm gonna be giving these a pretty involved three outta three wrenches on the difficulty meter and a three to four hour job. So the SR Performance axles that I have here today are going to be a great option for any GT, V6, or GT500 owner that's either in need of a replacement axle or for someone that's just looking to get into a tougher setup. These axles are gonna be great for the Mustang owner that's using their car as a daily driver or a weekend warrior, in comparison to a car that's gonna be seeing track time every weekend, as these aren't gonna be manufactured with the same tolerances as another set out there like something from Moser or Strange. In terms of the construction and materials here, we're gonna see these are going to be manufactured out of an OE type material, which is gonna be 1541H high manganese steel, which is typical of what you're gonna find from most, if not all aftermarket axles. Now in terms of the pricing here, you should expect to be spending 300 bucks for this kit. In comparison to some of the other options out there, you're gonna see that they can easily go for upwards of about a thousand dollars, but that's gonna be based on their intentions and what they're gonna be used for, and I just wanted to give you an idea of what else is out there. Switching gears to the installation portion of the video, like I said up top, this is gonna be a three outta three wrenches on the difficulty meter. It's definitely not something for the faint of heart. However, if you have done this kinda work before or if you opened up your rear end previously, I don't think you're gonna have that much trouble, but this is something that I honestly wouldn't leave to a novice wrencher out there. Now I will say this up top that this is gonna be a brief overview or glance at what's gonna be entailed to get these onto your car. A couple steps might be missing here, but you're gonna have a wealth of information in order to help you get these installed on your car if you choose to tackle this in your garage. Now looking ahead, some things I'd make sure to have on hand here are gonna be a full socket set, a couple jack stands, a few oil pans, and then some fresh oil for when you're gonna be cracking that diff open. Now to start, I'd suggest loosening the lug nuts on your car before you get it up in the air. Once it's on the stands, take everything off and then remove your caliper, caliper brake, rotor, and dust shield. So once that's done, you're gonna wanna get underneath the car and locate the pumpkin or the diff where you're gonna wanna position a fresh pan underneath, locate the fill plug, and then begin taking the differential cover off. So after that's cracked, that's when the fun part starts coming in. You're gonna need to locate the lock bolt inside of the housing which will need to be removed, then you'll pull the pinion shaft along with the C-clips, and you're damn near done pulling the OE set. After this, assuming you do have new ABS rings, they're gonna need to be pressed on, and if you don't have the equipment to do this in-house, I might suggest having a shop do this just to be on the safe side. After that, it's merely gonna be throwing everything back together and buttoning the car back up. Again, you're gonna be looking at a pretty solid three outta three wrenches on the difficulty meter here and about a three plus hour job. All right, so just to wrap things up here, some final thoughts, if you're the Mustang owner that's in need of a quick fix for a broken axle or if you're just looking for something a little bit more tough than your standard setup, I would definitely recommend checking these out for your Mustang. So I'm Alex from AmericanMuscle, and that's my quick review and breakdown of the SR Performance 31 Spline 5 Lug Axles, fitting the '05 through '14 GT, '11 though '14 V6, and '07 through '09 GT500, available right here at

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • 1541H High Manganese Steel Alloy
      • 31 Spline Axle
      • 5 X 4.5" - Five Lug Design
      • 32.810" / 31.680" Axle Length
      • Kit Includes Driver and Passenger Side Axles
      • Bearings, Seals and Studs Also Included
      • Fits 2005-2014 GT, Bullitt, BOSS, 2011-2014 V6 and 2007-2009 GT500 Mustangs with 8.8" Rears


      Performance Upgrade. If your running a heavily modified or forced induction S197 Mustang, your factory axles might be too weak to take the additional punishment. But after installing a set of SR Performance 1541H alloy steel axles, you will be sure to get all your Pony's power and torque firmly planted to the pavement - where it belongs.

      Built to Out Perform. SR Performance Axles are forged from premium quality 1541H high manganese steel alloy that is induction heat treated for an axle shaft that is stronger and much more durable than stock, making it perfect for high stress street and race applications.

      Application. This pair of SR Performance 5-Lug 31 Spline Axles are specifically designed for use on 2005-2014 GT, Bullitt, BOSS, 2011-2014 V6 as well as 2007-2009 Shelby GT500 Mustangs that have the factory 8.8" 31-spline LSD installed. ABS rings are not included.

      Application Note: 1986-2004 V8 Mustangs came factory equipped with 28 spline axles, except for 2003-2004 SVT Cobras which were 31 spline. All 2005 and newer V8 Mustangs come equipped with 31 spline axles.

      SR Performance

      Fitment: 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 Details

      MPN# 525038

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (49)

      Write a Review

      Ratings Summary

      4 out of 5 overall rating from 49 customers

      Installation Time: Full Day

      Installation Cost: $250-$500

      • November 17, 2019

        5 2007 GT - JonathanS Installation Time: Afternoon

        Great replacement.

        My driver side axle was bent, I got these great fit studs that came with them were the same size as my stocks. Just hammered the studs into the axle easy then tapped in the abs ring. Pretty straight forward.

        Helpful (1)
      • September 11, 2019

        5 2007 GT - FRjhracing Installation Time: Full Day

        Straight forward install Completed on jack stands.

        Only difficult part was pressing the abs rings and removing them from old axles. Bearings and seals went in perfect. Seal design is a bit different than stock, in my opinion they are an upgrade to the stock seal design. Fitment was right on. Lug bolts are shorter! Depending on your needs... may either reuse the factory type, or buy new ones. They're usable but definitely shorter if you plan on running spacers or aftermarket rims...could be an issue.

        Helpful (2)
      • August 27, 2019

        4 2005 GT - Nogo Installation Time: Afternoon

        Great product get longer studs

        This product is very nice and well built you will have to take old abs rings and put them on these you should also get longer studs because the ones that come with this are too short

        Helpful (1)
      • May 20, 2019

        5 2007 GT - Asmodaus Installation Time: Afternoon


        Installed them in a couple hours and car rides so smooth, had a slightly bent axle beforehand so its noticeably better. Just pulled wheels off, calipers, and abs sensor then took off differential cover slowly to let oil drain. Press the axle in so you can remove the C clamp and slide it right out. Knocked out the studs in the stock axles to replace and used a torch to heat and pry off the abs ring, then heat it up again and gently beat it on the new axle.

        Helpful (1)
      • April 08, 2019

        5 2008 GT - Anonymous Installation Time: Afternoon

        Great Deal

        Great Price for a decent set of replacement axles, installed in a couple hours with no issues. The only thing I disliked was that the wheel studs supplied are too short. Other than that, everything is great!

        Helpful (0)
      • February 17, 2019

        5 2005 GT - StepphonS Installation Time: Shop Install Installation Cost: $100-$250

        SR performance 8.8 axles

        These are great .

        Helpful (0)
      • January 30, 2019

        4 2005 GT - JesusO Installation Time: Afternoon

        Good product

        Only thing wrong is that the lug nuts are too shor.

        Helpful (0)
      • January 28, 2019

        1 2014 GT - AndrewC

        SR Performance splines

        Terrible fit. 3/4" too long. Got the rear end disassemble just to find out the new splines would not fit.

        Helpful (0)
      • January 18, 2019

        1 2007 GT - KristopherK Installation Time: Less than 1 Hour

        Bad Product

        Bearings were slightly bigger than Ford factory bearings there for a while I was not able to use them and press them in. I have done this many times before. The studs that came in the kit are about a quarter of an inch shorter than the factory studs also along with that the spline on the end of the axle had a chip in it due to it being pushed out of the bottom of the Box not saying it was from the manufacturer but definitely done in shipping and handling and the top of the box was ripped open

        Helpful (2)
      • January 05, 2019

        5 2013 V6 - jerry Installation Time: Weekend

        Stronger Is Better

        They look Good i wish they Had Product Sticker on the End of the outside Like the Picture i am sure they will be what i need thanks for quick Delivery

        Helpful (1)

      Questions & Answers (10 answers)

      5 Top Rated Questions

      Ford charges me $294.00 for 1 axle, my driver side axle is broken, this seems like a very good deal to get 2 for 261 dollars but are they really better than factory axles? Also will it hold 600 hp?

      • These axles are stronger than the factory axles and will hold a higher level of power consistently, however are not rated to a specific horsepower figure.

      Helpful (3)

      With this axle will you maintain abs on a 2007 GT?

      • Yes

      Helpful (3)

      Does the come with the oils? If not what oils are recommended?

      • The SR Performance 8.8 Axles does not come with the oils. You would want to use whatever is listed in your owner's manual.

      Helpful (0)

      Will this fit 2012 Ford Mustang 3.7 liters V6 motor?

      • Yes, the SR Performance 8.8 Axles - 31 Spline 5 Lug will be compatible with the 2012 V6s.

      Helpful (0)

      If I were to buy the axle would I need one new abs tone ring or two?

      • Unless your stock rings are bad, you can certainly utilize the stock rings on this application.

      Helpful (0)
      Post Your Question
      5 More Questions
      Has the stud issue been resolved? I've read in the reviews that the given studs are too short. Thanks 1 answer
      What is the horsepower rating on these axles. 1 answer
      Are these axles comparable to OE specs or built stronger the factory 1 answer
      Is this all the parts I’ll need for replacing my current axle shafts with these? Or do i need other parts or oils? 1 answer
      Does this fit on the drivers side . The back rim ? Is it for all ? The front and back ? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (2) 31 Spline Axles
      • (10) Wheel Studs
      • (2) Outer Axle Shaft Bearings
      • (2) Seals

      Tech Specs

      • Splines: 31
      • Type: C-clip
      • Stud Pattern: 5 x 4.5"
      • Stud Type: 1/2" Press in
      • Length: 32.810" / 31.680"
      • Material: 1541H alloy steel

      Will It Fit My Mustang

      • Boss 302 - 12, 13
      • Bullitt - 08, 09
      • GT - 05, 06, 07, 08, 09, 10, 11, 12, 13, 14
      • GT500 - 07, 08, 09
      • V6 - 11, 12, 13, 14

      Fits 8.8" rear gears with 31 spline LSD or Spool only

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