I have a bad vibration in the driveline of my 49 after getting it back together with the T5 trans and the 3.73 rear end. I installed a crossmember under the trans (tubular type). This took about 60% of the vibraton out. Next I installed shims to change the pinion angle a little and this took out about another 20%. I read alot of articles on setting up the driveline and I thought I had it right. I guess most things with these old trucks are trial and error. (emphisis on error) :rolleyes: Thats where I'm at now. I'm fairly certain that the wheels are all balanced, unless one slung a weight. And the driveshaft is new. I assume the shop I got it from balanced it. :rolleyes: Guess I'll keep teaking things till I get it right. If anyone has any suggestions that I should try, I'm all ears. Thanks.