VIBRATION at 3000RPM and up???

Ishman 306

Founding Member
May 18, 2001
67
0
6
St Petersburg, FL
About 8 months ago I changed my clutch b/c it was slipping. I ordered a king cobra clutch. So I resurfaced the flywheel and installed the new clutch, resurfaced flywheel, pilot bearing, and throw out bearing. I rode easy on the car for about 2 months, and then one day when bringing up the rpms, the car starts to vibrate at 3000 RPM then lets off a tiny bit little about 4200, then back on until I shift at 5500.
The vibration is bad under load, but it is present( just less than under load) when reving in neutral or w/ clutch in. This has remained the same and now I am fed up with it.
Another thing that is happenning, is that when the car is idling, somtimes about half the time is sounds like a knocking sound is coming from the shifter area, it knock w/ the clutch in or out.

Here is a list of things I have tried:

I have replaced the balancer, taken the belt off and ran with no change, checked motor mounts(convertable) and tranny mount(poly), and they seem fine.

Any suggestions?????????