Clutch?

[ZackL]

Okay, so my brother is the one with the problem. He has an '87 Supra Turbo that tends to chatter about 50% of the time on take off. There is no other problem like slipping or noise from the clutch, it just chatters on take off.

Definition of chatter: It sounds like a chatter but it does shake the entire car. It's almost as if the diff locks and releases, it gives you that sort of feeling. You can feel it in the shifter and through the floor as well as hear it very loudly.

Any ideas on what the cause could be would be great.