Clutch chatter

I have a L-34 with a frame off restoration.

The 396 has been rebuilt, so I doubt I have oil on the clutch plate. I had the flywheel surfaced, new clutch plate pressure plate, throw out bearing, pilot bearing. I have real bad clutch chatter when I let out the clutch. I was told that it might be the motor mounts, so I changed the new factory mounts, for polyurethane mounts, It did seem to help but the problem is still there. I have changed all the universal joints as well. The only thing I did not mess with is the twelve bolt rear end, it seems to be alright. I have installed a lot of clutches in my day, but this baffles me.


Thanks for your help.
Dean