Hello there! I have a 66 D100 that I am converting to a 4wd. The parts truck I am using is a 77 3/4 ton W200. My main questions are how well does the steering match up, as in can I use the drag link and pitman arm from the 77as a direct swap? Also the truck has the np 435 4-speed. Question there is do I need to swap just the output shaft to mount the transfer case or swap the whole tail-housing? Thanks, any info is helpful!