Symptoms of Bad Transmission Mounts

by Quinn Marshall
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Transmission mounts are circular metal brackets that support the transmission and utilize rubber blocks to prevent the vehicle from vibrating and rattling while running. Most transmission mounts also come with rubber blocks or bricks, which sit between the chassis of the car and the mounting bracket to keep noise from being transmitted through the body of the vehicle.


A bad transmission mount can cause your vehicle to shake and rattle severely while accelerating. This is often caused by a broken transmission mount, but may result from worn or damaged rubber blocks. If the transmission mount breaks completely, the transmission may shift during acceleration, causing a knocking or clunking sound. If the transmission shifts and twists severely enough, it may damage other components, which cand result in additional noise and possibly damage.


When the rubber blocks between the vehicle's chassis and the transmission mounts break free or become damaged, the vibration and noise from the transmission will be conducted through the transmission mount and into the chassis of the car. This is most often recognized as a roaring or vibrating sound that echoes throughout the vehicle during acceleration. If the sound is caused by bad rubber blocks, the transmission mounts may break, damaging the transmission.


Though rare, if a transmission mount becomes damaged and breaks, the transmission may become dislodged and fall from the vehicle. This will result in thousands of dollars in damage and is not easy to repair.

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