GM Service Manual Online
For 1990-2009 cars only

    Object Number: 1778405  Size: SH
  1. Install the servo cushion spring (68), or springs (139), and the servo piston (77) onto the servo pin (76).
  2. Install the snap ring (70) onto the servo pin (76) in order to retain the springs (68) and piston (77).
  3. Install the new seals (78 and 79) onto the servo piston (77) and the servo cover (80).
  4. Install the servo piston assembly into the servo cover (80). Lubricate the piston seals with transmission fluid in order to aid in assembly.

  5. Object Number: 20168  Size: SH
  6. Install the servo return spring (75) into the transmission case (51).
  7. Install the servo cover (80) and the piston assembly over the servo return spring (75).
  8. Caution: Refer to Fastener Caution in the Preface section.

    Caution: Hand tighten servo bolts to prevent bore damage.

  9. Install the three servo cover bolts (25). Hand start the bolts. Tighten the bolts to 12 N·m (9 lb ft).