GM Service Manual Online
For 1990-2009 cars only

    Object Number: 31202  Size: SH

    Important: Before removing the transmission oil pump drive and driven gears, locate the identification dots on the gear faces in order to ensure proper installation.

  1. Remove the transmission oil pump drive (205) and driven (204) gears.
  2. Inspect the oil pump body gear pockets, crescent, pump body face, and bushing for scoring nicks and wear.
  3. Inspect the oil pump drive and driven gears for wear.

  4. Object Number: 31203  Size: SH
  5. Remove the transmission oil pump O-ring seal (5).
  6. Inspect the oil pump body fluid passages for debris and porosity.
  7. Inspect the oil pump body fluid passages for scored or irregular mating surfaces.
  8. Inspect the oil pump body fluid passages for cross channel leaks.
  9. Inspect the oil pump body bolt threads for damage.