Transmission Mount – GM (84109021)

Transmission Mount locates the engine, transmission or subframe and isolates vibration from the body. Rubber hardness and internal voiding are tuned to a specific powertrain, so a stiffer or softer substitute changes how much noise reaches the cabin.

Replace the Mount when engine movement is visible when the throttle is blipped, when a clunk appears on take-up, or when the rubber has separated from the metal. Replacing one worn mount often shows up the next one.

Ordering reference for the Mount is part number 84109021, categorised under Transmission Assemblies. Match that number against the component you are removing before you order.

The stock here is genuine GM, and this Mount keeps the original engineering number, which matters once a number has been superseded more than once.