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

14 Reviews
Our Price


  • Item #73002
  • MPN #A883153
  • Market Price $302.99
  • You Save 9% ($28.00)
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Customer Photos
  • 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!

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

Mustang Fitment: 1999 2000 2001 2002 2003 2004 Details

What's in the Box
  • (2) 31 Spine Axles w/ studs
Installation Info

Installation Time: (approx) 4 Hours

Difficulty Level:Mechanical expertise or professional installation required.

  • 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 View All

Overall Rating 5/5 Write a Review
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)

Great product!

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

Helpful (5) (0)

Customer Photos (4) View All

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Q & A (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

Question Resolved
Good Question (0) (0)
  • 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.

    Helpful (1) (0)

    Best Answer

    pyroman Year: 1995 Model: V6

    Top 500 Contributor

Show 1 more answer

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

lalek Year: 2003 Model: GT

Question Resolved
Good Question (0) (0)
  • 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.

    Helpful (0) (0)

    Prostreet02gt Year: 2002 Model: GT

Show 1 more answer

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

chrismlukowski Year: 2001 Model: V6

Question Resolved
Good Question (0) (0)
  • 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"

    Helpful (1) (2)

    Tracy67 Year: 2004 Model: GT

    Top 50 Contributor

Show 2 more answers

Reviews (14) Write a Review

  • 5 Stars 1.0 100%
  • 4 Stars 0 0%
  • 3 Stars 0 0%
  • 2 Stars 0 0%
  • 1 Stars 0 0%

out of 5 stars

14 Customers Recommend this Product

Filter By Sort By
  • 5/5

    Moser 31's

    March 09, 2010

    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

    Great product!

    May 11, 2010

    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 (6) (2)

  • 5/5

    Can't break em

    September 02, 2012

    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

    moser axles

    July 16, 2010

    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

    Moser 31 sline axles

    September 07, 2009

    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 (3) (2)

  • 5/5

    Moser 31s 04GT

    April 05, 2010

    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) (13)

  • 5/5

    Excellent Product

    November 06, 2014

    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 (0) (0)

  • 5/5

    Fit like a glove with the new diff

    September 29, 2014

    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 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2

    Helpful (0) (0)

  • 5/5

    reliable and durable

    December 22, 2012

    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 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 3 Corrapas Cove, TX USA

    Helpful (0) (0)

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