Free Shipping On Orders Over $49. Details

Talk to a Mustang Enthusiast
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Win $5,000 For Your Mustang! Enter Daily

Moser 8.8 Axles - 31 Spline 4 Lug (79-93 5.0L)

AmericanMuscle no longer carries the Moser 8.8 Axles - 31 Spline 4 Lug (79-93 5.0L). Please check out 1979-1993 Foxbody Mustang Axles & 5-Lug Kits for an updated selection.

Features & Details

  • Forged Steel Construction
  • 31 Spline
  • Hardened Bearing Seats
  • 4 Lug Axles
  • Fits 1979-1993 5.0L Mustangs
Performance Upgrade. If your 1979 to 1993 Foxbody is putting down serious power, your weak OEM axles aren't going to be able to transfer all your tire-smoking torque to the pavement. A pair of Moser Engineering 31 Spline Axles will let you light 'em up without worrying about weak axles.

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 your power is going 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.

Application. This pair of Moser Engineering Forged 31 Spline Axles is designed for 1979-1993 Mustangs with the 5.0 engine and 4 lug wheels.

Technical Notes. For use with a 8.8" 31 spline LSD or spool.

Fitment: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 Details

MPN# A883141

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

      Questions & Answers (2)

      2 Top Rated Questions

      doing a 351 (500-550hp) swap and a 31 spline swap my question is what brake system fits these?

      • Baer offers a few big brake kits for 4 lug set-ups, they have a 2 piston kit for the rear, and they also carry matching front kits in either 4 piston or 6 piston kits as well.

      Helpful (0)

      What else do I need? I want to change to these axles & 3.73 gears on my 1990 GT but I now have 28 spline & 3.23 gears. My question is what else do I need besides these axles & 3.73 gears? & is it possible?

      • In order to install these 31 spline axles on a vehicle with 28 spline factory axles, you would need a new differential with 31 spline spider gears.

      Helpful (0)
      Post Your Question

        Customer Reviews (6) Write a Review

        Overall Rating 4.7

        out of 5 stars

        • 5/5

          September 20, 2017

          90 mustang

          Really good quality I recommend to anyone who's looking for these type of axles!


          Year: 1990 Submodel: LX

          Helpful (4)

        • 5/5

          January 14, 2016

          Excellent insurance policy for my 8.8!

          Putting down almost 500 to the tire, I was worried about snapping the stock axles. The Moser 31 splines should do the trick. They fit great also.


          Year: 1992 Submodel: GT Long Island, NY

          Helpful (6)

        • 4/5

          May 24, 2014

          Great upgrade for my 85' that had 3.08 gears

          Kit came with everything I needed. Including two pinion crush spacers and two pinion nuts. This helps a lot for first time 8.8 builders because if you get the setup wrong the first time you have another chance at getting if right with no additional cost. The only draw back I found was that the motive gear pinion spacers had no sizes on them indicating what thickness they were. Other than that this is a great performance upgrade with some of the best parts on the market.


          Year: 1985 Submodel: GT Jacksonville, FL, USA

          Helpful (5)

        • 4/5

          January 25, 2014

          Excellent Machine Work

          Axles have excellent machine work. Splines are cut very well and surfaces of flanges are top notch. Also like how shafts do not neck down in any area. Did have two minor problems. Cross shaft in FMS 31 spline trak-lok is 1/8 larger dia (vs stock 28 spline trak-lok), pushing axles out a bit compared to stock. Had to shim calipers with washers. Other problem was 1.5 inch long studs where not long enough to use with stock 10 holes alum wheels that came on my 86. Moser 1.75 studs were inexpensive and easy to swap. Overall I am very happy with quality, looking forward to testing them out.


          Year: 1986 Submodel: GT Jackson NJ

          Helpful (5)

        • 5/5

          March 23, 2012

          Bullet proof

          Have had no problems with these axles with nearly 2000 miles and 10-20 1/4 miles passes launching at 5000rpm with drag radials.


          Year: 1986 Submodel: GT Byron,IL

          Helpful (5)

        • 5/5

          September 28, 2011

          Moser Axles

          I really like my new axles. Alot stronger than the stock axles. I'm no longer afraid to launch my car hard at the track, without worring about breaking anything. Great item!


          Year: 1990 Submodel: Other Elverson, PA

          Helpful (4)

        Related Mustang Categories