Built one and drove it as a daily driver for three years then of road for seven before I sold it. I converted to a small block chev, four speed and NP-205 transfer case. I used the original axles and gears. They were 5.83:1 ratio so top end was limited even with 39 inch tall NATO military tires. I later switched to 39 in boggers. Did a power brake and power steering conversion as well. Did lots of other little mods.
They are prone to axle breakage even with stock motors. I found a guy who was building axles for the rear and swapted them out.
I built that truck and drove it for ten years. This was one tough old piece of iron.
gold03