Join Date: Dec 2001
Location: Belleville, Illinois
Thanked 22 Times in 17 Posts
Re: Drive shaft vibrates - Does it need to be inde
Pictures would be good. If by indexed you mean put on the transmission or differential a certain way, it shouldn't matter. It could be that the torque at that speed is shifting the differential and using up the extra free play, or that you have too much U-joint angle, or too much of a difference between the front and rear U-joint angles, or it could be as simple as that you didn't get the bearing cups properly seated in the clamps on the differential.
In any case, 1/2" free play at the slip joint seems like too little to me. It would be pretty easy to use it all up when things start to flex and move around.