GM Service Manual Online
For 1990-2009 cars only

Condition

Action

DEFINITION: Noise during transmission upshift or downshift

Engine or transmission mounts

    • Inspect the engine mounts and the transmission mounts for wear or loose mounting fasteners.
    • Replace any faulty engine or transmission mounts or loose fasteners.

Exhaust system

    • Inspect the exhaust system for loose or missing hangers.
    • Inspect the exhaust system for contacting body or frame components.
    • Adjust or repair the exhaust system.

Interference with drivetrain or body

    • Inspect components surrounding the transmission assembly and engine for improper contact.
    • Repair or adjust as necessary.

Drive shafts

    • Inspect the drive shafts for worn components.
    • Replace the drive shaft if worn.

Engine malfunction

    • Ensure engine is operating properly.
    • Repair engine to operate properly.