It ain't the fan. I installed an electric fan in the 49 today and it still vibrates. So, I got :mad: and took the tranny out. Sent the pressure plate and flywheel out to have it balanced. Got my fingers crossed cause if that ain't it I'm in deep %#@^$. Have to be internal engine. One more thing to try before that is the harmonic balancer. Can't imagine it being bad. It looks good and does not wobble. Getting the flywheel off was a chore as I used red loctite on the bolts. eek