GM Service Manual Online
For 1990-2009 cars only
  1. Clean the transmission case in a suitable solvent. Air dry the transmission case.
  2. Clean all sealant material from retainer bolt threads.
  3. Inspect the transmission case for the following conditions:
  4. • Cracks
    • Scratches
    • Damaged threads
    • Burrs
    • Nicked mounting surfaces
    • Damaged sealing surfaces
    • Damaged front or rear bearing bores
  5. Inspect the machined mating surfaces for flatness with a straight edge.
  6. Inspect the bearing races and bores for wear, scratches or grooves.
  7. Use a fine mill file to dress minor scratches or burrs.
  8. If scratches, grooves or scoring cannot be removed by hand with a soft stone or crocus cloth, replace the component.
  9. Clean up damaged threads with the correct size tap.
  10. Replace a cracked housing.