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Side Bearing Preload (All Exc. Corvette)

  1. Measure thickness of original side bearing preload shims. Then, select a service spacer (0.160" for 6 1/2" and 7 1/2" ring gear 0.170" for 8 1/2" and 8 3/4" ring gear) and service shims with a total thickness slightly less than the original shims. Install differential case in housing. Install service spacer between each bearing cup and housing with chamfered edge of spacer against housing. Install left bearing cap loosely so that differential case is free to move.
  2. With left bearing race and spacer against housing, install both right and left service shims previously selected between right bearing race and service spacer. Insert progressively larger feeler gauges between right shim and service spacer until a noticeable drag is felt.
  3. Remove carrier and install ring gear (if removed). Select two shims with a total thickness equal to that of service shims and feeler gauge and reinstall with carrier (equal thickness on each side of carrier). Adjust differential backlash, then preload differential bearings by replacing both shims with shims 0.004" (0.008" total) thicker.
    NOTE: Do not attempt to reinstall the original production shims as they will break when tapped into place. Previously installed SERVICE shims may be re-used.
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