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Home >> GMC >> 1966 >> I1500 Automatic Trans >> Repair and Diagnosis (Single Page) >> Drivelines & Axles >> Differentials & Drive Axles >> Drive Axles - General Motors 5200-7200 Lb. >> Overhaul >> Reassembly & Adjustment >> Pinion Depth

Pinion Depth

  1. Place selected pinion shim in bore in carrier and install pinion and retainer assembly. Install pinion seal retainer bolts and tighten evenly.
    NOTE: If original gears are used, use new shims of same thickness as those removed. If new gears used, use.021" shim for standard starting set up.
  2. Lubricate differential bearing rollers with engine oil and place outer races over bearings. Install differential assembly and adjusting nuts in carrier, then install differential bearing caps. Adjust ring gear backlash, then make tooth contact pattern test.
  3. Examine contact pattern carefully. If pattern not satisfactory, remove pinion and retainer assembly and change shims as necessary. Repeat adjustment procedure until a satisfactory pattern is obtained.
    NOTE: Changing pinion depth will change ring gear backlash, therefore it is necessary to readjust backlash whenever pinion shim is changed.
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