Most likely it is a weak pressure plate assembly (the springs) although it IS POSSIBLE for a flywheel to cause clutch shuddering / chatter if the face of the flywheel is not machined flat or it has been machined down beyond reasonable limits. The more material that has been removed during machining, the less efficient the clutch assembly will be especially under loads. In any case, I would recommend a complete inspection of all components, chatter soon overheats the clutch disk and glazes both the face of the pressure plate and the flywheel surface. Glazing then = more slippage and chatter.
Last edited by WillsLimo; 07/02/2009 10:43 PM. Reason: typo
