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I agree with the u joint. Pull the driveshaft and check them for play. I wouldn't be able to say it is the rear one, but I just had the same problem and it was the u joint.
u joints are the problem now my next qustion is wher do you guys buy them from i have put 3 sets in my truck and burt them all out i got them at advance auto .and yes i had my drive shaft spun it is good
Napa carries quality parts. Since you killed 3 U- Joints it sounds like some else is wrong making them fail. A bad transmission monut, or a bad driveshaft or bad installation.
i got mine from advance auto parts, they do seem kinda junky but i check them every week just incase(i've already had them blow apart on me) next time i'm going to napa.
vibration
