Well I never had problems with vibration fron my Centerforce DF but those things don't slip at all, and they are famous for breaking things on 5 sp cars. So I kept the Centerforce pressure plate for the holding power and feel but I put in the King Cobra disk and I love it and I have never had any issues with it it holds up fine in evryday traffic and at the track on slicks and 4500-5000RPM launches.
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My Ride Check Out My Site 91GT, Holley SysteMAX II Kit-Heads 2.02" x 1.60",Full MAC exhaust 1-5/8" Long tubes, 2-1/2" O.R H-Pipe, 2 1/2" cat back, 12" K&N Filter, RNH PERFORMANCE Ram Air, Ron Davis Radiator, Full Suspension,3:73's, Welds, Best on new motor-12.60 @ 108, no traction 1.98