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

Market Price $302.99 You Save 9% ($28.00)
Our Price


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  • Item 73002
  • MPN# A883153

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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. Wheel studs are not included.

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

Fitment: 1999 2000 2001 2002 2003 2004 Details

What's in the Box
  • (2) 31 Spine Axles
Installation Info
Will it fit my Mustang?
  • Bullitt - 01
  • Mach 1 - 03, 04
  • GT - 99, 00, 01, 02, 03, 04

Fits 8.8" rear gears with 31 spline LSD or Spool

People Who Bought This Item Also Bought

Most Helpful Reviews

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.

Helpful (1)


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

Helpful (1)

Overall Rating 5 out of 5 stars
Read All 20 Reviews

Customer Photos (5) Submit Your Photo

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12 Questions / 5 Answers

Ask a Question

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


Helpful (1)
  • Yes - these do come with the studs as shown in the photo.


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


Helpful (0)

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!!!


Helpful (0)
  • You shouldn't have an issue installing the Moser 8.8 Axles, even if your Mustang is still stock.


Any recommendations for wheel studs to use with these axles?


Helpful (0)
  • Your factory wheel studs as well as many aftermarket wheel studs should work perfectly fine with these axles. If you are looking for a stronger upgrade, we recommend ARP or Moroso wheel studs.


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?


Helpful (0)
  • I do apologize about the mix up here. As stated in our description and our "Whats in the box" section; The Moser 8.8 Axles - 31 Spline 5 Lug do not include wheel studs.


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


Helpful (0)
  • The Moser 8.8 Axles do not include wheel studs, this kit is just for the axles.


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Customer Reviews (20) Write a Review

Overall Rating 5.0

out of 5 stars

  • 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 (1)

  • 5/5

    November 04, 2016


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


    Year: 2003 Submodel: GT

    Helpful (1)

  • 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 (1)

  • 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 (1)

  • 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 (1)

  • 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 (1)

  • 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 (1)

  • 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 (1)

  • 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 (1)

  • 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 (1)

  • 5/5

    May 11, 2010

    Great product!

    these are so much thicker than the wimpy stock axles! they are ready to handle some serious launches with slicks!

    Jordan S.

    Helpful (6)

  • 5/5

    March 09, 2010

    Moser 31's

    Got these with my Motive 4.30's and launched from 3k-5k on my BFG stickies more times than I can count. Best on the market!


    Helpful (6)

  • 5/5

    October 22, 2007


    I run these in my GT and very content with the performance of the axles. They are very durable and can pretty much take any rpm you throw at them. Not to mention the pretty reasonable price. Ive been running them on slicks for about a year and have no problems at all.

    Dustin Barlow

    Helpful (7)

  • 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 (2)

  • 5/5

    September 07, 2009

    Moser 31 sline axles

    Had these installed the other day along with 4:10 gears and 31 splne differential in my 2003 Mach 1. So now it is time for some sticky tires and let her RIP! Great AXLES!!!

    Marc P.

    Year: 2003 Submodel: Mach 1

    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 (1)

  • 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 (1)

  • 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 (1)

  • 5/5

    July 16, 2010

    moser axles

    Price was right. Axles seem great, Mechanic said they are some of the best! Thanks American Muscle ! Affordable. Remember to know if you need them prepped for ABS.


    Helpful (3)

  • 5/5

    April 05, 2010

    Moser 31s 04GT

    I got these when I had my gears changed out. I took the high torque differential carrier out of my dads 08 GT500 when he crashed it. I needed the 31spline axles to use it. Used it with 3.73s. Great piece and went smoothly. (we sold the GT500 and bought an 09 and built it up to 650RWHP by the way)

    Dickie Ayer

    Year: 2004 Submodel: GT

    Helpful (3)

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