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Moser 8.8 Axles - 31 Spline 5 Lug (99-04 GT, Mach 1)

AmericanMuscle no longer carries the Moser 8.8 Axles - 31 Spline 5 Lug (99-04 GT, Mach 1). Please check out 1999-2004 Mustang Axles & Halfshafts for an updated selection.

Features & Details

  • Forged Steel Construction
  • 31 Spline
  • Hardened Bearing Seats
  • Fits 99-04 GT, Bullitt & Mach 1 Mustangs
Performance Upgrade. If you're putting down lots of power and torque in your GT, Bullitt, or Mach 1, a pair of Moser Engineering 31 spline axles is a high performance upgrade that will help you put that tire-smoking power to the ground.

Street and Strip. If you have a heavily modded street or strip Pony, your stock 28 spline axles might be too weak to take the heat. These premium quality forged steel axles have 31 splines to ensure all your power and torque are transferred straight to the pavement - where it belongs.

Built to Perform. Moser Engineering 31 Spline Forged Steel axles are made with some of the toughest, strongest, most durable materials available. These axles feature machined C-Clip grooves to fit OEM application 8.8 inch rear ends. They are non-tapered and also feature hardened bearing seats for durability and performance under high stress conditions.

Customize. Moser Axles feature the ability to be shortened and resplined if you decide to narrow your rear at a later time.

ABS. Worried about deleting your factory ABS? Well now you don't have to with Mosers quality design you can relocate your factory ABS sensors when installing your new Moser axels!

Application. This pair of Moser Engineering 31 Spline Axles are designed for the 1999-2004 GT, Bullitt and Mach 1 Mustangs.

Tech Note. For use with a 8.8" 31 spline LSD or spool.

Fitment: 1999 2000 2001 2002 2003 2004 Details

MPN# A883153

CA Residents: WARNING: Cancer and Reproductive Harm -

What's in the Box
  • (2) 31 Spine Axles
Installation Info
Tech Specs
Will it fit my Mustang?

    Customer Photos (6) Submit Your Photo

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      Questions & Answers (15)

      5 Top Rated Questions

      what all is needed when swapping from 28 spline, do they use the same size axle bearings and c-clips

      • These Moser 8.8 Axles will use the same size axle bearings and C Clips. In addition to the axles, you will need a 31 spline differential.

      Helpful (2)

      Lug Studs Do these come with lug studs installed, as shown in the photos?

      • Yes - these do come with the studs as shown in the photo.

      Helpful (1)

      c-clip eliminators? can these axles be used with c-clip eliminators??

      • Yes. Plus you can order them with the c-clip elims. already pressed on, plus any thing else like reluctor rings for ABS/ Traction Control to stay working if you want.

      Helpful (1)

      Are these A883153-A ? I am using a Auburn HP. These axles are designed specifically for use with an Auburn differential. 31-spline Auburn differentials use a narrower pin and require a button dimension of .312'' (the standard dimension is .285''/.295'')

      • The part number for these axles is A883153. These are not the ones that are specifically designed to be used with the Auburn differential.

      Helpful (0)

      I am looking into rebuilding my rear end with upgrade diff, 4:10s, and a one piece aluminum driveshaft. Will these axles delete my rear ABS or will I have an option to keep my rear ABS?

      • With the Moser 8.8 Axles you have the option to relocate your factory ABS sensors.

      Helpful (0)
      Post Your Question
      10 More Questions
      What is the weight of these axles and do you know the weight of my stock axle. I believe this is rotational mass and if I add LOCKIND Diffs that will be addition mass 1 answer
      Im not putting serious power to the ground. i just have a few minor upgrades on my vehicle at this moment but will eventually be adding more. im just not sure to what extent. That being said, my rear end is in need of a major over haul and i was just wondering, will it be ok to add these right now with me not putting much over stock horsepower down? Thank you so much!!! 1 answer
      Any recommendations for wheel studs to use with these axles? 1 answer
      in the Q A, it is stated that this product both comes with the wheel studs installed, and also says they are not included. there is also a review that states the product came with them already pressed in... which is it AM~!?!?!?! also, where can i order these with the C clip elims /abs ring/ studs pre installed? 1 answer
      I bought a set of these axles and was wondering what type of wheel studs came with these. Looking to do some road racing and want to make sure they are strong or should I upgrade them. Any specs on them would be appreciated. Thanks 1 answer
      Relocate abs sensor? Is this a standard step in order to replace the 28 spline to a 31 spline axle? is this necessary step in other words? 1 answer
      Will I need a new drive shaft too? I have an auto '01 GT, and I've already bought and recieved these axles from you guys, along with 4.10 gears and trac-lok lsd. I've been looking around, reading, and am curious if these will fit and work properly with my stock shaft which currently supports the 28 spline axles. Thank you in advanced! 3 answers
      V6 Will these fit a 2001 V6 if I get the proper gears? 3 answers
      axles how much do they weight compare to a stock axles.Thanks 2 answers
      Do i need to buy new abs rings for these axles, to retain abs brakes i got the new diff, 3.73 gears, install kit, and only need the axles now, 2 answers

        Customer Reviews (26) Write a Review

        Overall Rating 5

        out of 5 stars

        • 5/5

          January 05, 2019

          Definitely recommend

          Can’t go wrong with these,rear end feels much firmer and better handling


          Year: 2004 Submodel: GT

          Helpful (1)

        • 4/5

          December 07, 2017

          Look Great

          First off the QandA section says they dont come with studs, mine did already pressed on. Second the packaging is terrible. Nothing to protect the splines or studs, just thrown in a box which i recieved open. Other than that they look good.


          Year: 2003 Submodel: Mach 1

          Helpful (2)

        • 5/5

          November 04, 2017


          Amazing product. Would recommend. They're strong as heck too.


          Year: 1999 Submodel: V6

          Helpful (2)

        • 5/5

          August 22, 2017

          Good looking axles

          Installed and tested on the track they are working great. I can now leave the line at 4500 rpm with no worry's.


          Year: 1995 Submodel: GT

          Helpful (3)

        • 5/5

          June 08, 2017

          Nice Piece

          The axles are a very well made and came with wheel studs. The old ABS rings went on with no issues using my HF 20T press. The packaging is not good allowing the axles to contact each other during shipment, luckily there was no damage.


          Year: 2002 Submodel: GT

          Helpful (2)

        • 5/5

          May 04, 2017

          This weekend

          Everything came in great with no issues. They are getting installed tomorrow, so I can try them out this weekend. Thanks AM!!


          Year: 2002 Submodel: GT

          Helpful (2)

        • 5/5

          February 10, 2017

          Rear end is stout

          So I got the 4.10 gears and just thought why not do the whole rear end so I got these a detroit locker and the 4.10 with rebuild kit and I'm happy with my choice locks up rally nice and now I don't have to worry about the axles breaking


          Year: 2004 Submodel: Mach 1

          Helpful (5)

        • 5/5

          November 04, 2016


          perfect fit great price, no installation issues product was perfect.


          Year: 2003 Submodel: GT

          Helpful (5)

        • 5/5

          August 16, 2016

          Solid Product

          Major improvement over the stock axles, the machining of these is clearly of superior quality. Great to know there are products out there that can leave you with piece of mind when putting down some serious power.


          Year: 2000 Submodel: GT

          Helpful (6)

        • 5/5

          June 05, 2016


          Axle came in fast and ready to go. Had to press in the new abs rings but other than that were good to go.


          Year: 2001 Submodel: GT

          Helpful (5)

        • 5/5

          May 07, 2016

          Moser 8.8 Axles - 31 Spline

          Awesome!!! These axles are so much thicker than the stock ones! super beefy!! nice thing is the studs come pre-installed! The only thing you have to do is move your ABS ring over, and slide them in!


          Year: 2000 Submodel: GT

          Helpful (4)

        • 5/5

          July 06, 2015

          Axles to trust

          With some pretty heavy launches on these, I can say that they are great. I would put them in any future car. I can really trust them, they fit great, and they have been going good so far! It was a flawless install.


          Year: 1994 Submodel: GT

          Helpful (5)

        • 5/5

          November 06, 2014

          Excellent Product

          Just installed these along with a FRPP 31 spline differential and couldnt be happier. Great upgrade for any car that sees the track from time to time or even for a track only car. These Moser axles can handle quite a bit of abuse.


          Year: 1999 Submodel: GT Philadelphia, PA, USA

          Helpful (5)

        • 5/5

          September 29, 2014

          Fit like a glove with the new diff

          These are a great "insurance" when adding more power to your mustang. I shouldn't have to worry about breaking a axle anytime soon!


          Year: 2002 Submodel: GT

          Helpful (5)

        • 5/5

          December 22, 2012

          reliable and durable

          These axles are strong an durable. I have done some research an moser is one of the best on the market. I highly recommend this product.


          Year: 2004 Submodel: GT Corrapas Cove, TX USA

          Helpful (5)

        • 5/5

          September 02, 2012

          Can't break em

          Got this with 11.5 wide slicks launched at 6000rpms with 360 horsepower at the flywheel haven't broken anything if you want slicks or radials and launch higher than 4000 Rpm's then all you need are these and 31 splined differential!


          Year: 2003 Submodel: GT Conway, ar

          Helpful (7)

        • 5/5

          February 03, 2012

          the way to go.

          you cant beat the quality, and its so much stronger then the factory 28 spline why wouldn't you want to go with the 31 spline.


          Year: 2001 Submodel: GT Aston, PA

          Helpful (5)

        • 5/5

          February 01, 2012

          Moser Axles

          Once again, great service with AM. These axles are so much beefier than the stock ones. Install was pretty straight foward. Thanks again AM


          Year: 2001 Submodel: GT Texas

          Helpful (5)

        • 5/5

          October 13, 2011

          Get rid of your wimpy 28 spline axles, 31 spline is the way to go!!

          I added these when my diff was going bad. These are great with a an upgraded LSD and this help put some tires to the pavement for better track time. One of my favorite mods and worth the investment if you race.


          Year: 2003 Submodel: GT Wayne, PA

          Helpful (5)

        • 5/5

          August 01, 2011

          Excellent Upgrade!!

          Super easy install and a must if looking to upgrade your LSD. Definitely helped put the power to the ground where I needed it when on the track.

          Karen B

          Year: 2003 Submodel: GT

          Helpful (5)

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