1986-04 Mustang 8.8" 3/4" Rear Differential Cross Pin for 28 Spline Applications

1986-04 Mustang 8.8" 3/4" Rear Differential Cross Pin for 28 Spline Applications

The Cross pin is a hardened shaft that installs in the case of your 1986-2004 Ford Mustang and keeps the spider gears in place.

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Item #FOR-F900401

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  • 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 28 Spline

 What's in the Box

  • (1) Rear End Carrier Cross Pin

Rear Differential Cross Pin For 28 Spline
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!

Commonly Asked 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.

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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

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