GM Service Manual Online
For 1990-2009 cars only

    Object Number: 12999  Size: SH

    Important: The automatic transmission oil pump assembly has a pump slide, seal, vanes, and a rotor that are factory selected for size. Do not switch parts with another pump.

  1. Remove the oil pump cover bolts (205).
  2. Remove the oil pump cover (201).
  3. Remove the pump rotor (210), the vane rings (209) and the bushing (208).
  4. Remove the vanes (211), the oil seal ring (212), and the slide seal (213).
  5. Caution: Valve springs can be tightly compressed. Use care when removing retainers and plugs. Personal injury could result.

  6. Remove the outer and the inner oil pump prime springs (222, 223).
  7. Remove the pump slide seal (220) and the slide seal support (221).
  8. Remove the pump slide pivot pin (215).
  9. Remove the oil screen assembly (219).