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1986-11 Ford Mustang 8.8" 7/8" Differential Cross Pin for 31 Spline Applications


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Mustang 8.8" 7/8" Differential Cross Pin for 31 Spline Applications (86-11)

The Cross pin is a hardened shaft which installs into the case and keeps the spiders securely in place. In semi-float applications, it also prevents the axles from sliding inward into the carrier case.

Item# FOR-F880402

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Benefits

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

Features

  • 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

Product Description

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.

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