For 1990-2009 cars

A noise or vibration that is noticeable when the vehicle is in motion MAY NOT be the result of the transmission. Refer to the Diagnostic Starting Point - Vehicle procedure.

If noise or vibration is noticeable in PARK and NEUTRAL with the engine at idle, but is less noticeable as RPM increases, the vibration may be a result of poor engine performance.

• | Vibration may also be caused by a small amount of water inside the converter.

• | Inspect the engine and transmission mounts for damage and loose bolts.

• | Inspect the transmission case mounting holes for the following conditions:

- | Missing bolts, nuts, and studs

- | Stripped threads

- | Cracks

• | Inspect the flywheel for the following conditions:

- | Missing or loose bolts

- | Cracks

- | Imbalance

• | Inspect the torque converter for the following conditions:

- | Missing or loose bolts or lugs

- | Missing or loose balance weights

- | Imbalance caused by heat distortion or fluid contamination

• | If the noise or vibration is noticeable in PARK and NEUTRAL with the engine at idle, but is more noticeable as RPM increases, the vibration may be an engine imbalance or a transmission imbalance. Refer to Torque Converter Diagnosis.