no real need to swap the drw hubs. Just put your dual wheels on that axle. Unless the wheels will not clear the brake drums, or is too narrow and the tires hit the frame, but you shouldn't have any issues. If so then a set of wheel spacers should work. Also, I now you plan on driving the truck still, but your gearing is what will really hurt you. A NV4500 is 2nd gear with either 3.54 or 4.10's is really too fast of a gear for a 2wd. If you don't mind slower speeds and alittle higher RPM, I would recommend swapping to a 4.63 or 4.88 rear end gear plus some 33" tires. Only other option would be to find a NV5600 6spd with a transfer case and run 4th low with 3.54 or 3.73 gears. You could try running 2nd high with the NV5600 with 4.10 gears, but I doubt the mainshaft in the tranny would last over 1 or 2 hooks. Also with the full spool, you will hate driving it very much, especially on wet roads. You best option would probably just to make it a track only pull truck and drive something else. But to each thier own i guess.