It all depends on how good your fabricating and welding skills are. You should be able to get all the parts from a 4x4 Ranger and drop it all in, but if you are going to do it, might as well find a solid front from an 66-77 Bronco. The earlier D44's are drum brake, but that is easy to convert, so look for a later 73-77 axle as it is a ball joint, disk brake axle and the 760x joints will fit. The problem after that is the front will be a 5x5.5 lug pattern and the rear will be a 5x4.5 pattern. You will need to either get an aftermarket set of axles or change the whole rear. To do the SAS swap, you will more than likely need at least 4", if not 6", of lift to fit some 35's.

After you figure the axle parts out, you will need to go into the transmission/tranfer case swap and get a set of driveshafts made. A stock set will be a good starting point, but with any lift, they will need to be lengthened, so might as well start with new ones.

All in all, it will be costly, so if you are not too attached to the truck, it me be more cost effective to just find a 4x4 truck and build from there.