>My third Sach's clutch in 30,000 miles is starting to chatter, as did the
>previous 2.  Now it's time for a new one.  What is wrong with these things?

Check the archives.  Look for other causes, such as worn motor/trans mounts.
The original cause of the problem may very well not be the clutch; rather,
the clutch chatter and premature wear are resulting symptoms of the actual
problem.  Especially likely if you've gone through three in 30k miles
(assuming you've also been changing the pressure plate, t/o bearing, and
pilot shaft bearing). You need to identify the true cause of the problem or
you may keep eating clutches.

- Ron Salmon
 The Bus Depot
 http://www.busdepot.com