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Alloy USA 8.8-Inch 5-Lug Axles; 31 Spline (05-09 Mustang GT, GT500)

Item 18958
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Market Price $344.99 You Save 13% ($45.00)
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$299.99 (pair)

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      Video Review & Installation

      Hey, Justin with here, taking a closer look at the alloy USA 31 spline 8.8 axle kit, fitting all 2005 and newer GTs, all 2011 and newer V6's, and all 2007-2009 GT500s. Anyone who is hardcore into drag racing probably has a few stories to tell about experiencing a busted axle. The truth is the factory axles are fine for most but when you really start adding some horsepower and launching on a sticky tire, you run the risk of damaging or even breaking those factory axles. Speaking of which if you want to see us subject our project cars to a few quarter mile beat downs, you have to subscribe to our YouTube channel by clicking on the link below. This kit from Alloy comes with everything needed to eliminate those weak factory axles from the equation in your S197. The major players in this kit are the brand new 31 spline axles which have been made from a high quality alloy steel, using a unique heat treating process which basically just ensures a stronger, much more durable axle. Alloy then uses what's called a cold form, rolled spline process to process a spline that is roughly 35% stronger than a standard cut spline. Alloy stand behind this design so much that they include a 10 year warranty with every set of axles sold. If you want to hear more about what our customers are saying about using these axles in their own rides, you have to click the link below to head back to the product page at That kit does include the factory ABS sensors and even includes brand new wheel studs, bearings, and axle seals. Even though we always encourage our backyard mechanics to tackle almost any job, diving into the rear end and swapping axles can be a little tricky if you've never done it before, so that's why we recommend leaving this one in the hands of your local shop. On the other hand if you have no problem around the garage, just leave yourself about 4 hours from start to finish to get the job done. Either way if you have any questions about the fitment, the axles themselves, or about the install, don't hesitate to get in touch with one of our Mustang experts. So if you're serious about dragging your S197 and you want to eliminate the possibility of a busted axle altogether from the equation, then you might want to check out the Alloy 31 spline axle kit available right here at

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • 1541H Alloy Steel
      • 31 Spline
      • 5 X 4.5" - Five Lug Design
      • 10 Year Warranty!
      • Driver and Passenger Side Axles Included
      • Fits 2005-2009 GT and 2007-2009 GT500 Mustangs with 8.8" Rears


      Performance Upgrade. If your Mustang is heavily modded or running a forced induction setup, your stock axles might be too weak to take the heat. These premium quality 1541H alloy steel axles will ensure that all the power and torque is transferred straight to the pavement - where it belongs.

      Stronger than OEM. Manufactured from high quality 1541H alloy steel using a computer controlled induction heat treatment that results in a stronger, more durable axle shaft. Alloy USA uses a cold-formed rolled spline process that produces an axle spline that is up to 35% stronger than standard cut splines.

      10 Year Warranty. These Alloy USA axles come with a 10 year limited warranty to be free of defects in material and workmanship from the date of purchase. Some limitations do apply. Please see the full Alloy USA Warranty disclosure for details.

      Application. This pair of Alloy USA 5-Lug 31 Spline Axles are specifically designed for use on 2005-2009 GT and 2007-2009 Shelby GT500 Mustangs that have the stock 8.8" 31-spline LSD installed.

      Application Note: 1986-2004 V8 Mustangs came factory equipped with 28 spline axles, except for 2003-2004 SVT Cobras which were 31 spline. All 2005 and newer V8 Mustangs come equipped with 31 spline axles.



      Alloy USA 12189

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (2) 31 Spline Axles
      • (10) Wheel Studs
      • (2) Outer Axle Shaft Bearings
      • (2) Seals

      Tech Specs

      • Splines: 31
      • Length: 31.688" / 32.813"
      • Type: C-clip
      • Stud Pattern: 5 x 4.5"
      • Stud Type: Press in

      Customer Reviews (43)

        Questions & Answers

        10 More Questions

        Will It Fit My Mustang

        • Bullitt - 08, 09
        • GT - 05, 06, 07, 08, 09
        • GT500 - 07, 08, 09

        Fits 8.8" rear gears with 31 spline LSD or Spool only

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