GM Service Manual Online
For 1990-2009 cars only
  1. Start the engine.
  2. With the engine at idle speed and the transmission in Park or Neutral, observe the vibration.
  3. Turn the key off.

Removal Procedure

  1. Remove the bolts attaching the flexplate shield.
  2. Remove the bolts attaching the flexplate to the torque converter.
  3. Rotate the torque converter 120 degrees.

Installation Procedure

  1. Install the flexplate to the torque converter. Secure with the attaching bolts.
  2. Tighten
    Tighten the bolts to 44 N·m (33 lb ft).

  3. Install the flexplate shield. Secure with attaching bolts.
  4. Tighten
    Tighten the bolts to 7 N·m (60 lb in).

Start the engine and check for vibration. Repeat the procedure until you obtain the best possible balance.