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I just installed a new SPEC Stage 3 Carbon clutch to replace a toasted Stage 3 Kevlar in my ’94 Z28. The installation went well but I seem to have bad chatter engaging 1st gear from either a stop or slight roll. Hill starts are impossible -the whole car shakes. I’ve tried varying the amount of slippage and rpm when starting off, but I can’t seem to get a smooth engagement. Shifting between the other gears once underway is smooth, and the clutch is not slipping.
Is the clutch grabbing too soon as it is not properly broken-in? It appears that it just grabs and then bogs the engine to the point of stalling resulting in shuddering. Is this normal?
What is the break-in procedure for this clutch?
Can anything be adjusted to eliminate the engagement chatter?
Could be many reasons, 1) did you have the flywheel resurfaced? 2) Did you index PP, basically make sure it is perpendicualr to flywheel..? 3) Is the geometry of the clutch fork correct?
Also some more high performance clutches do chatter..