On a two piece driveline it is wise to mark the shafts in relation with one another. This way when they go back together they should still be balanced. If someone took them off and didnt do this and they just put them back in then that can be the cause of the bearing going out. When a shop balances them they will mark them for you so that they can be put back into the truck in relation to each other. At the speed the driveline and the bearing spins it doesnt take long to screw them up if they are not balanced.
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