vibration at 3k

[mark sweetser]

just got a centerforce dual friction clutch kit installed. at same time, swapped to a new centerforce throw-out bearing, and a new pilot bearing supplied by the shop were i had install done. problem is, at 3,000 RPM in any gear, there is a bad vibration that rattles the whole car. wasn't there prior to clutch swap, even after swap to 3.73 gears. i still have 200 miles or so to go on the 450-500 mile break-in period recommended by centerforce on clutch. when the rattle comes on, the car seems to lose some steam. will this clear up after 200 or so miles, once the clutch is broken in and set correctly? i have been going fairly easy on the gas during the break-in (no WOT).