I constantly keep breaking the U-joint on the rear drive shaft at the t-case. I can only drive for about 1 to 2 days and then it breaks. I had 1/2 ton running gear with 3.08's and it was doing it, then I swapped out 3/4 ton running gear with 4.10's and it still does it. So I swapped out the drive shaft for anothing thinking that it may have been out of round or balance, but this one keeps doing it to. I have checked the t-case fluid and changed it. I only have a four inch lift and my blocks are slightly shimmed, so I don't think it's the angle. I have a NP203 transfer case. Any help would be greatly appreciated I would love to be able to drive this thing.