I have already replaced the U-Joints post-Moab 2008, and the drive shaft was balanced. Having it balanced temporarily helped, but did not fix it, and now it is back to normal and getting much louder! It sounds like I am driving over the rumble strips on the side of the road to wake sleepy drivers. It grinds at highway speed when lightly getting off the gas. Accelerating has no grinding and completely off the gas has no grinding, in between lots of grinding over 60mph.

Was told by Merlin that (although not too common) it is not unusual for the drive shaft to fail internally as it is many parts put together, not a solid piece. Of course, with my luck, I get this problem. The dealer claims the lift and big tires are not affecting it, it is a faulty drive shaft (they think...).

Ascinder, I will get back to you on your drive shaft... Is it both pieces? or just one? There are two parts to the drive shaft according to Merlin. I need to find out which I ordered. Much Thanks!!!