[rkreigh]

check the balance on the flywheel and clutch assembly

the "tuning pins" for the balancer and flywheel for the dynamic balance should be transferred fromt the old flywheel to the same positions on the new one. but since that can't be done, the only way to do it again is having the rotating assembly balanced which really isn't feasible (or cheap) because you need the crank out of the engine.

the "goo" on the beam is an isolater under the c beam bolts

I believe it's purpose is to better secure the bolts and keep them from "digging in" to the soft alum

the bill boudreau beam plates do a much better job at that and stiffen the drive train.

on the balance problem, since the engine "should be" internally balanced I don't think you should be noticing a big difference with a new flywheel as the tuning pins really just are "fine tuning" the balance to achieve the legendary smoothness.

hopefully it's something else like the driveshaft!