Check the motor mounts. Most cases of clutch chatter from a stop are caused by the engine bouncing around on loose mounts. Oil on the clutch disc is another possibility, but if you've had things apart recently that should have been discovered already.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!