1986-14 Mustang 8.8" 7/8" Differential Cross Pin for 31 Spline Applications

1986-14 Mustang 8.8" 7/8" Differential Cross Pin for 31 Spline Applications

Keep you Mustang spider gears secured into place to help prevent your axles from sliding inward into the carrier case with these differential cross pins!

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Item #FOR-F880402

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  • Ford Mustang - 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010


  • Holds spider gears together
  • Commonly replaced when replacing rear gears


  • Fits 7.5" or 8.8" Mustang Rear End
  • Recommended for stock up to 4.56 rear gears
  • For 31 Spline

 What's in the Box

  • (1) Rear End Carrier Cross Pin

8.8" 7/8" Differential Cross Pin
Check that carrier cross pin, and replace it at the first sign of wear! These are Mustang stock-replacement cross pins are for use in 7.5" rear ends with 3.45 or lower (numerically) ratios, or 8.8" rear ends with 4.30 or lower ratios. For higher-numbered gears, see our notched cross pins. Don’t forget to replace the retaining bolt at the same time!

Common Question
My cross-pin shaft is scored and the spider gears wore into it. What happened?

When a differential is traveling in a straight line, the spider gears remain motionless in the carrier. It is not until one tire turns faster or slower than the other that the spider gears rotate on the cross pin shaft. This most commonly happens when turning a corner. However, other situations cause the spider gears to spin much more rapidly, such as getting stuck in the mud or snow. When this happens, the spider gears can rotate on the cross pin shaft so quickly that it slings all the differential oil away from it, giving way to metal-on-metal wear. This causes the cross pin shaft and the gear to get so hot that they melt each other, sometimes to the point where they weld themselves together. Damage such as this can not only damage the spider gear set, but destroy the carrier and ring & pinion set.

- Fits 1986-2014 Ford Mustangs with 31 Spline Differential

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