Yes, it's a 4x4 truck. A Ramcharger with a 6" lift kit. I have to use a double cardan on the rear because of the angle. The suggestion in the driveshaft world is to point the pinion up to transfercase, but the pinion ends up way high., the front bearing is then higher than the fill plug.
When you overfill these diffs, it floods the axle tubes, and the seals end up leaking prematurely. I changed the axle seals to the newer 2 piece seals, the same as on my 3500.ram, it has a sleave that seals to the axle tube that rotates in the seal, instead of the seal wearing down the axle tube seal surface,Dodge revised the fill level on later trucks to just below the fill plug, and it fixed the leaking.
I once found a paper written on double cardan joints that showed how to setup the angles
For a "broken w" angle, but I can't find it now.