dmwracing42

iTrader: (3)

Just finished up my swap and took it for a test drive. I ran the car on the jack stands and noticed a vibration above 2000 RPM with the car in neutral but didn't think much of it. During the test drive the car had a pretty serious vibration above 2000 RPM. I imagine it has to be clutch balance related because it did it in neutral too, but I'd like to know if anyone else has any ideas.

Heres my setup. T56 out of a 95 Z28. Centerforce clutch and disk that was previously used in the Camaro before I pulled it. Spec clutch sc66s flywheel for use with a two piece RMS 350. Stock tranny and motor mounts.

I read that the stock flywheels and clutches had to be clocked, but I didn't think that would be the case with this setup. If they do, please let me know. I've also been told that the pressure plate might have weights on it because it was used on the externally balanced lt1 previously, but I thought any weights would have been on the old flywheel. Any help is appreciated. I'm looking at pulling the tranny and getting the flywheel and pressure plate balanced but I'd really rather not.

Justin69

How is your driveline angle? With my BMR trans crossmember, my trans sat about an inch too low in the rear. I made a spacer and now its smooth.

dmwracing42

iTrader: (3)

I looked into this, and it looked to me like the yoke on the rear end was actually angled toward the ground, the drive shaft seemed to be on an upward slant toward the transmission. I moved the adjustable torque arm up a hole, but couldn't go to the top hole because of the mounting location for the old tranny mounted torque arm. It seemed to help the driveshaft angle but I still have the vibration. I did notice that the transmission mount is not too stiff and the tranny can move pretty freely. I was thinking of switching to one of the energy suspension mounts, but have heard this actually increases vibration because more of the motion is transferred to the car instead of being damped by the mount.

Biledriver

Does it vibrate while sitting still, if so it's not drive line angle. Are you using the LT1 pull style clutch? When I did my 2 piece seal LT1 t56 I had to use a extended pilot bearing and I used a standard clutch.

19irocz85

I had that exact probablem i have the spec sc66a flywheel, 2piece rear main aluminum flywheel, i had to send it to a machine shop they neutral balanced it and its good now