10 lug wheels and special 8 lug to 10 lug on the front end for 4x4 conversion.
factory all 2wd with odd spacing on the leaf springs . it has a solid mono beam king pin axle. only runs 5 lug nuts on the front 2wd setup.
there were some that have been converted to 4x4 from a company. not sure on the tcase as the parking break was on the tail end of the nv4500 stick or 4l80-e auto.
thay do sit real tall when converted to 4x4. thay used a king pin dana 60 axle.
i know there was a lot of info in a thread here or pirate . and these trucks are tanks for a truck at 15,000 gvw on them. thay were a 454 vortec or a 6.5 turbo for motor options. and i dont think i have ever seen them only in a anything but a std cab only. so dont look for extra room in the cab.
i know of a few people who have them and love them for a super truck .