I have a full size 85 chevy 1/2 ton with dana 60 front, 14 bolt rear, 350, turbo 400, NP 208c, full cab, no bed yet, 6 inch lift, 37x12.50s, and I need some suggestions on how or if I need to beef up my u-joints and or driveshafts. Right now everything is stock. Thanks in advance.
That's a pretty stout drivetrain to start with. Just make sure you don't skimp on u-joints and go with something cheap. I have had good luck with Spicers and was told by the guy who built my drivshafts to stay with that brand for the best results. I just changed one out that started squeeking really bad at the start of our last ride. I didn't think it would survive the day, but it stayed together under abuse and kept the shaft turning. When I pulled it out, there were no needle bearings left. The other thing is to make sure you have some good gearing in there to turn them tires and take some stress off the tranny.
Oh, one other thing, you never mentioned how much lift you were running or if it was a long or short box. You may want to lower you transfercase and tranny a little to decrease your driveshaft angle a bit. I lowered my Jimmy's case about an inch to eliminate binding and stress, but that was because of the 6" lift and the short wheel base.