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Message: <blockquote data-quote="95PGTTech" data-source="post: 806067" data-attributes="member: 9525">When he had the pinion bearing replaced, or replaced the pinion bearing and seal himself, that made the factory markings useless if the corresponding components were not indexed, as the pinion flange was moved.Remove the driveshaft, get it balanced. Then install it, and mark it. If vibration is still present, rotate 90 degrees and repeat as necessary. If it is still present in all four positions, you're going to need to do some more involved stuff like getting the wheels and tires balanced, measuring the pinion angle, and measuring the straightness of the axle tubes.</blockquote>