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

15 Reviews
Our Price


  • Item #73002
  • MPN# A883153

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

Most Helpful Reviews

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)

Great product!

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

Helpful (5)

Read All 15 Reviews
Overall Rating 5 out of 5 stars

Customer Photos (5) View All Photos

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7 Questions / 7 Answers

Ask a Question

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,

silverbullett99 Year: 1999 Model: GT

  • The old rings will work just fine, but depending on the cost you might just wanna replace them anyways. When doing any type of work you should replace any small parts , gaskets, and seals that are inexpensive to increase overall life of that part or system.

    Best Answer

    pyroman Year: 1995 Model: V6 Top 1000 Contributor

    Good Answer (1)

Show 1 more answer Question Resolved

axles how much do they weight compare to a stock axles.Thanks

lalek Year: 2003 Model: GT

  • There is not much of a difference in weights. I would want to say the aftermarkets are worth the extra security though vs. a few extra lbs. they feel the same to me though.

    Prostreet02gt Year: 2002 Model: GT

    Good Answer (0)

Show 1 more answer Answer This Question I need this answered (0) (0)

V6 Will these fit a 2001 V6 if I get the proper gears?

chrismlukowski Year: 2001 Model: V6

  • Your car came from the factory with the 7.5" rear axle, not the 8.8". You need axles for that and it likely has 28 spline, unless you buy a new differential. I do not know if anyone produces aftermarket axles for the 7.5"

    Tracy67 Year: 2004 Model: GT Top 50 Contributor

    Good Answer (1)

Show 2 more answers Question Resolved

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Customer Reviews (15) Write a Review

Overall Rating 5.0

out of 5 stars

  • 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) (0)

  • 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 (5) (0)

  • 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) (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 Model: Mach 1

    Helpful (4) (2)

  • 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 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 1

    Helpful (1) (0)

  • 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 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 4 Philadelphia, PA, USA

    Helpful (1) (0)

  • 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!

    Top 500 Contributor


    Year: 2003 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 1 Conway, ar

    Helpful (1) (0)

  • 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 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Aston, PA

    Helpful (1) (0)

  • 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) (2)

  • 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 Model: GT

    Helpful (3) (14)

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