GM Service Manual Online
For 1990-2009 cars only
  1. Clean all of the parts using an approved solvent.
  2. Visually inspect all the parts for excessive wear or breakage. Replace the parts if necessary.
  3. Inspect the pinion gear and the side gear teeth for any of the following conditions:
  4. • Wear
    • Cracks
    • Scoring
    • Spalling
  5. Inspect the thrust washer for wear.
  6. Inspect the fit of the side gears on the axle shafts.
  7. Inspect the differential case for cracks and scoring.
  8. Important: Do not replace the thrust sleeve unless necessary.

  9. Inspect the thrust sleeve for excessive wear.
  10. Inspect the side gear bore for scoring. If scoring is present, replace the entire differential.
  11. Replace the differential if you find any damage to the case.