Indexing Torque Converter

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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.

Raise and suitably support the vehicle.
Rotate the torque converter one bolt position.
Align the torque converter hub (2) in the engine crankshaft (3) and install the torque converter to flywheel bolts.

Fig 1: Aligning Torque Converter Hub In Engine Crankshaft
Courtesy of GENERAL MOTORS CORP.
Lower the vehicle.
With the engine at idle speed and the transmission in PARK or NEUTRAL, observe the vibration. Refer to Noise and Vibration Analysis .
Repeat this procedure until you obtain the best possible balance.
Install the transmission converter cover bolts and the cover.