Just bought a 2002 ZX3 with 100,000 on it.Changed manual transaxle fluid,anti-roll mount. The transaxle makes a marble rolling around a can noise below 2000 rpm. Over 2000 it is quiet. It shifts good and I am getting 32mpg. The slave cylinder is leaking so I am going to pull it and replace that and the clutch. the local transmission shop is no help. There does seem to be some slop in the motor mounts, could they be transmitting noise that you normally would not hear?