Thanks. the dana 300 is a transfer case out of late scout 2s and CJ-7s. all gear driven instead of chain. it's similar to a NP205. better ratio in low and lighter but still plenty strong.
75-79 Dodge 4x4s were full-time, the RC and W100s had lousy front wheel bearings that don't hold up well. so by converting to the 300 and axles from a 80-84 with Warn hubs(factory auto hubs were ok but not as good as warn manuals, nice a beefy to hold up to big tires etc...)i now have true part-time 2wd for street driving, picked up 2mpg with the nv4500, 2 more with the part-time conversion, about 14mpg at 65mph now even with 4.56s and 33s. hoping for a couple more with efi.