Originally Posted by LarryBible

Find a tech who is accustomed to driving a car to check for vibrations. A tech will immediately be able to tell you whether the vibration is at wheel speed or driveshaft speed.

If it is at driveshaft speed, check the flex disks. If they are okay, put a washer between the carrier bearing mount and the body and retighten. Then see if the vibration is still there.

Good luck,