Nissan motorsport offer LSD for this truck and many drive ratio available, you should be able to find a 4x4 unit, i believe they had LSD.i have been wondering about this also. i want to put a late model 10 bolt in. i know my d21 has 44 in wide spring perches, which i think is half inch narrower then the chevy mounts. the nissan has wheel mounts about 69 inches wide which i think is also very close to chevy. a 10 or 12 bolt, 9 inch, dana 44 or 60 would have a lot better aftermarket support. has any one done one of these swaps, and are they simple?