GM Service Manual Online
For 1990-2009 cars only
  1. Remove the cover. Drain the oil.
  2. Important: Use this information in the diagnosis of an axle problem. Information on ring gear backlash also helps in setting shim packs for locating and preloading the differential case.

  3. Inspect the ring gear backlash.
  4. Important: If possible, determine the cause of the axle condition before the disassembly of the axle.

  5. Inspect the case for metal chips and shavings. Determine where the chips and shavings came from, such as a broken gear or bearing cage.