GM Service Manual Online
For 1990-2009 cars only

    Object Number: 749311  Size: SH
  1. Mark the servo piston pin in the released position (1).
  2. Warning: Wear safety glasses when using compressed air in order to prevent eye injury.

  3. Apply compressed air to the servo apply passage (3), and mark the apply position on the piston pin (2).
  4. Measure the distance between the release and apply marks (a). Refer to 3rd Gear Band Servo Piston Pin Selection to select the correct servo piston pin.