I am in the process of installing a 700R4 transmission and NP 208 transfer case in a 1969 Blazer. It will have a six inch suspension lift also. I am trying to get the motor as level as possible. Should I rotate the rear axle up toward the transfer case or leave it level? If I need to rotate it, how do I do that? Same question for the front. I thought I read some where that the u-joint connection at each end should be within 2 degrees of each other.

if it has the slip yoke with only a ujoint at each end then the drive line angles need to be the same. 4 degree difference at the slip and 4degree difference at the pinion, for example. if you have a cv joint at the slip then the drive line should be straight with the pinion, 0 degree difference. use axle shims to adjust as necessary. get the angles as close as possibile when the rig is sitting flat on an even surface.

So if there are u-joints at each end the angle between the driveshaft and either the transfer case or differential needs to be the same at each end. Is there a maximum angle to stay under? I think I may have to go with a cv joint off the transfer case forward just to clear the cross-member. The cross-member had to be relocated to line up with the support bolts. This brings up another question. Mid-eighties parts blow-ups show a rod from the side of the transfer case up to the bellhousing with no bracket to the side rail of the frame for support. When I got it, it had a NP205 with this bracket to the side. Do I need this side bracket or is the rod to the bell housing enough?

The axle shims you mentioned, are they beveled? Do they go under the springs on top of the spring perch? Do they need to be welded in place?