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If you've ever watched someone work on a Ford differential, you've probably seen an item called a crush sleeve being installed. A crush sleeve is installed on the rear of the pinion gear to set pinion depth and helps set up pinion bearing preload when the pinion nut is torqued to the proper specs. The problem is, on high-powered cars with locking or high-bias differentials, they place more load on the pinion crush sleeve than normal and will actually compress it further, changing pinion depth. A solid crush sleeve (PN IK 4105, $16.32) prevents this distortion, and the pinion depth and preload is set by shims. View Related Article
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