For 1990-2009 cars

A noise or vibration that is noticeable when the vehicle is in motion may not be cause by the transmission.

A noise or vibration that is noticeable while the vehicle is in the P (Park) or the N (Neutral) position with the engine at idle, but is less noticeable as the RPM increases, may be the result of poor engine performance.

Inspect the following components for the conditions stated:

• | Tires and wheels -- Uneven wear; imbalance; mixed sizes, or types.

• | Suspension components -- alignment and wear; loose fasteners. Refer to Section 3C.

• | Engine and transmission mounts -- damage; loose bolts.

• | Transmission case mounting holes -- Missing bolts, nuts, and studs; stripped threads; cracks.

• | Flywheel -- Missing or loose bolts; cracks; imbalance. For flywheel balancing, refer to Engine Flywheel Replacement in Engine Mechanical.

• | Torque converter -- Missing or loose bolts or lugs; missing or loose balance weights; imbalance.