GM Service Manual Online
For 1990-2009 cars only

To determine and correct a torque converter vibration, the following procedure may have to be performed several times to achieve the best possible torque converter to flywheel balance.

  1. With the engine at idle speed and the transmission in PARK or NEUTRAL, observe the vibration.
  2. Turn the engine OFF.
  3. Remove the torque converter bolts.
  4. Refer to Flexplate to Torque Converter Bolts .

  5. Rotate the torque converter one bolt position.
  6. Install torque converter bolts.
  7. Refer to Flexplate to Torque Converter Bolts .

  8. With the engine at idle speed and the transmission in PARK or NEUTRAL, observe the vibration.

Repeat this procedure until you obtain the best possible balance.