GM Service Manual Online
For 1990-2009 cars only
  1. Inspect the carrier connector for damaged splines and teeth. Replace as required.
  2. Inspect the shift fork for wear, scoring, and damage to the thrust surfaces. Replace as required.
  3. Inspect the differential sleeve and the inner output shaft for damaged splines and teeth. Replace as required.
  4. Inspect the damper spring for breakage. Replace as required.
  5. Inspect the differential actuator and the engagement switch for damage and frayed wiring.