With a bad drive plate, even the slightest variation in firing impulses from the engine can cause transmission noise. This plate absorbs the engine's firing impulses, is the last link between the engine and transmission, and connects directly to the transmission's input splines. If the engine is tuned up and running well, the drive/damper plate may be the cause of noise. If compression is not within 10% in all cylinders, uneven firing impulses may cause the transmission to make backlash noise. A compression check is a must before putting any blame on the transmission. Transmission noise is most commonly caused by a poorly running engine or a worn out drive/damper plate.
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