Unirevolt-
I would just use any decent bearing grease. (I used Napa brand red grease when I rebuilt my spring pax. Worx great! Good luck brother! And Smiley- I dont have near the lift you have (3.5" susp. lift) But I do have a one piece, C/V (1310 u.j.s)driveline in my 96 (Rodideo). I ended up using 4 deg. shims on my rig. But...what I found was, that under load, with normal spring wrap, the operating angle of my pinion flange was actually was actually a little too high-I.E. my driveline was pointing quite a few degrees higher that my t-case flange. I then used the shims to lower the angle of my driveline (thick end of shim faces rear). My driveline angle is now perfect, and my truck has never run smoother! For what it's worth... <img src="/forums/images/graemlins/smile.gif" alt="" />
P.S. 1 pc. C/V drv. line- Hands Down-Best mod I have done to my rig! I lived WAY too long with the dreaded A.L. (after-lift) rear end rumble! <img src="/forums/images/graemlins/cheers.gif" alt="" />