Viberation at 4500rpm after flywheel install...

well, was worried about this.., and now I got this viberation.
Installed my Centerforce Billet steel flyweel and Dual Friction clutch assembly, together with new bolts and bearings and a steel bearing retainer.
The new clutch has been carefully breaked in, normal city stop and go driving.
Its smooth and the clutch feels great. So, if I rew it to around 4500rpm its starts viberate a litte around 4200 and disappers again after 5000rpm.
I installed the driveshaft in the same position as before, and its viberates even if i just rew the engine with the clutchpedal to the floor.
The only thing I have been adding to my car is a set off STEEDA crossmember poly bushings, and energy suspension transmission poly bushing/transmission month. So, do I have to rebalance my engine internals,try another dampfer or just live with it ... Any ideas ? Thanks.

speedytang said:

I now have the same problem and I think it is the bushings allowing more vibration to be felt. I replaced and checked everything like you have and the car drives great and the shifter shakes no more than before but I have a vibration and mine changes with rpm.

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..Thanks for your input. Yes, I has been thinking of that. The new bushings are hard as stone, compared to the old soft rubber ones from-86. As mentioned , my car runs great, but Iam a little worried about the vib. problem.
The best thing ,is that It may shake off some mud and other paricles from the chassi...

Thanks....

vristang ..., Thanks for your info. Hope it would work out in a way this summer, sort of need to drive my car, not only work on it...