My clutch was bad when I got the car with about 30K on it. I put in a new LT4 plate, new disk and had the flywheel resurfaced. Fast forward to 83K. Clutch still engages smoothly and does not slip but just at the moment between partial and full engagement-only in first gear, as far as I can tell-it chatters. I was talking to a friend last night and he said since it didn't chatter on first engagement, maybe the chatter was a motor mount problem. Anybody ever run into this?

Incidentally, this is a daily driver that does not see track use.