Passenger Side Engine Mount Frame Side Bracket – GM (84255039)

Passenger Side Engine Mount Frame Side Bracket mounts and isolates a heavy powertrain component. Hydraulic-filled and solid designs are not interchangeable even when the bolt pattern matches.

Replace the Frame Side Bracket when there is excessive movement under load or a vibration that was not there before. A collapsed mount loads the others and they fail in sequence.

Reference number for the Frame Side Bracket: 84255039. It is filed under Engine Mounts & Covers, and it is the number that has to match the part coming off the vehicle.

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is genuine GM, and this Frame Side Bracket keeps the original engineering number, which matters once a number has been superseded more than once.

Position matters here: this is the passenger (right-hand) unit, and fitting it to the other side will not work.