Hey I have an 07 2500 with the 5.9 cummins. I put a 2.5 inch lift in it and running 35's. Other than that the truck is stock, but Ive gone through at least 3 U joints on the rear end of the rear driveshaft. Any Ideas how to correct this? Was thinking that shimming the rear end to tilt a little upwards to take some of the angle of that u joint out might help. Any Idea what size shims would be used to correct the angle there?

 

I know what the number is but there is a driveshaft angle you should not exceed. Look in the service manuals linked in my signature