Chad's 68 Camaro V3.0 build. LS3 & TCI goodies

[Mkelcy]

Originally Posted by Chad-1stGen

Thanks Mike.

I actually never tried revving the motor with the clutch. I was attempting to describe that the vibration is engine speed dependent only. I will try revving with the clutch in to see if that impacts it at all.

My understanding is you should check all bell housings and that you buy replacement alignment dowels to get proper run out.

True, but the T56 specific bellhousings don't have a round surface that's concentric with the crank. The bellhousing follows the shape of the transmission. That's why you need some sort of fixture to check runout.

Originally Posted by Chad-1stGen

I am stumped by the vibration. It's 100% related to engine speed. Will vibrate in neutral sitting still in the driveway when you rev up the motor. vibrates driving at speed until you push in the clutch and/or shift into neutral at which point the vibrations are gone.

I was trying to say that I doubt that the bell housing could be so misaligned that you get a bad vibration, yet have the vibration compeletely disappear when you depress the clutch with the car moving. The input shaft is still inserted into the pilot bushing and is still hypothetically being whipped around if the bellhousing is misaligned. Again, I'd look at the engine and the flywheel/pressure plate. Was the pressure plate new and zero balanced?