I just got done installing a M6 in my formerly A4 Z28. It drive pretty good except for when you rev it up above 4k RPM's it has a really noticeable vibration. It does it when it's in neutral but does it far worse when you are getting on it and rev it up high. It didn't do this with the A4 in it.

I bought a new clutch, pressure plate, TO bearing and a Pilot bushing. I also had the flywheel resurfaced.

I didn't have the flywheel balanced or anything.It is a stock flywheel of a 96 LT1 same car i got everything else from. Should i have had it re balanced to match the flex plate off my A4 setup.

Also when i let the clutch out in neutral it has a lot of bearing noises. What would this be. Also give me some other ideas of stuff that could be causing. The clutch is a brandnew SLP set up.

Thanks
Shawn

 

YES!!!! You need to get your flywheel balanced to your flex plate. That's probably your problem.

 

well what about aftermarket flywheels. How do they know what to balance to. I am hoping that is what it is because i don't know what else it could be.

Thanks
Shawn

 

If I'm not mistaken, even the aftermarket flywheels need to be balanced. The only one I know of that could get away with it would be the Street Twin.

 

Well can i just take my old flex plate and my new flywheel to any machine shop to have them balanced?

Thanks
Shawn

 

I would think so. Just call and ask a shop, they should at least be able to steer you in the right direction.