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you ought to hear the amont of noise the manual trans makes when a microphone pickup is attached to it... there is no such thing as a quiet manual trans anymore.
the majority of the clunk however is not in the trans, the differential, the differential mount bushings or any other component save one: the driveshaft.
the rear coupling attached to the differential is rubber and under torque they twist slightly. when the clutch is depressed the torque is removed and the coupling snap backs, which causes the snap noise, which yes is becuase of the buildup of driveline lash. replace this coupling with a solid one and your clunk is greatly reduced.
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