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Did they include a new pilot bearing?
A bad, worn, or mis-installed pilot bearing can cause an annoying, and sometimes teeth-rattling, chatter. This occurs because the clutch disc will have a different "center" than the flywheel 'n pressure plate (as the input shaft sags a few thousandths). The chatter occurs because we intentionally slip the clutch during engagement, so these mismatched centers must constantly realign -- and the clutch disc physically moves to do this. Hence the chatter.
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Don Foster (near Cape Cod, MA)
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