GM Service Manual Online
For 1990-2009 cars only

    Object Number: 49539  Size: SH
  1. Inspect the reverse band servo components for the following conditions:
  2. • Damaged, worn or porous servo piston (44)
    • Damaged servo piston oil seal ring (43)
    • Damaged, worn or porous servo cover (40)
    • Damaged servo cover O-ring seal (41)
    • Damaged servo cover retaining ring (39)
    • Broken or collapsed servo piston return spring (49)
    • Broken or collapsed servo piston cushion springs (45, 47)
    • Damaged or worn servo piston apply pin (48)

    Object Number: 49531  Size: SH
  3. Assemble the servo piston (44), the servo piston cushion springs (45, 47), the servo piston cushion spring retainer (46) and the servo piston apply pin (48).
  4. Install the servo pin retaining ring (42) onto the servo piston apply pin (48).
  5. Install the servo piston oil seal ring (43) onto the servo piston (44).
  6. Assemble the servo piston return spring (49) onto the servo assembly.

  7. Object Number: 48173  Size: SH
  8. Position the transmission so that the oil pan is facing down.
  9. Install the servo cover O-ring seal (41) onto the servo cover (40).
  10. Install the servo and cover assembly (40-49) into the case.

  11. Object Number: 48166  Size: SH
  12. Use a long screwdriver in order to depress the reverse band servo cover (40) by prying against the transmission holding fixture.
  13. Hold the reverse band servo assembly compressed.
  14. Use a small screwdriver in order to install the reverse band servo cover retaining ring (39).
  15. Remove the long screwdriver.