Well, we put a new flexplate in the Camaro tonight, and no more shaking. Here's the weird part. After driving it a bit, my buddies rolled into first pretty good, and heard a small thump. After getting it back on the lift, he found out that ONE of the converter to flex plate bolts had sheared off. Any idea how that happens? The only thing I can think of is that he torqued that one down too much. Any ideas??