i changed the universal joints in the ride this past weekend, didnt have a vibration or nothing. i had a squeeking noise consistant with the rotation of the drive shaft, so i swapped them since i had the car up in the air. now here lyes the problem i now have a vibration, intermitant seat of the pants vibration, ive put the car back up and checked the torque of all the bolts. now what i didnt do was make sure that the yoke or the flange went on the same way it came off. shouldve i? i never have on other vehicles ive owned. this the first stang ive had though. (YES THE SQUEEK DID GO AWAY SO MAYBE IT WAS A GOOD JUDGMENT CALL