I sent you a PM but I was trying to clarify what you meant by chattering?
Typically, a bad throw out bearing will only make noise when you push the clutch in. A bad pilot bearing will "chatter" when the clutch pedal is not depressed and if it is really bad, could make noise all of the time whether the clutch is in or not.
Check the gap between the throw out and the fingers on the pressure plate first. There should be a 1/4" gap between the 2 when the pedal is up at the rest position. If it is not adjusted correctly and is in constant contact, that's bad and could be the source of your noise.
Just to clarify something here...I do not work for Tremec. What I do is work in tech support for a Tremec distributor, Keisler Engineering. What we do, is take the Tremec TKO and the T56 and retro-fit them into classic musclecars. We put together kits that allow you to change your muscle car from the factory 3 speed, 4 speed or automatic and convert it into a modern 5 or 6 speed setup.:bigthumbsup
Richard
if my t56 chatters is that bad? i know the the t-5s do it. when its idling you can hear like a clacking noise. could it be low fluid, or even a syncro? i dont think its the throw out bearing, the clutch is fairly new. any ideas?