I have horrible vibration through the shifter on my 88 gt 5speed convertible. I just replaced the harmonic balancer yesterday, it helped a little. I sometimes hear a clunk in the rear when shifting to 2nd, but only when its cold? I just bought the car 2 weeks ago and it has done it the whole time. There was a new clutch, pressure plate, pilot bearing, and throwout bearing installed about 4 months ago the guy said. the clutch is really stiff too. I can't even spin the tires in 1st??? I can take it to 3grand and dump it and it just kinda goes. Is the clutch maybe not engadging/disengadging all the way? does a bad pilot bearing or bad install make a bad vibration like this? thank you very much guys