I have a Suzuki Samurai and one of the mods I've done is swap in lower transfer case gears. I have to think it's possible to take a NP205 and swap in higher transfer case gears (if anyone makes them). After swapping in the higher T-Case gears, you would have the same as a brownie box, except you'd only have low and high, no direct. A NP205 is rated for more than 275lbs/ft and 150hp as well. With a 1.98 low ratio, combined with a granny low, combined with a 4.56 or lower rear end, you oughta be able to pull just about anything. Couple that 4.56 rear end with a .7 OD, and you can cruise down the road all day long.
4.56 rear, with .7 od, and 33" diameter tires=2113 RPM @ 65 MPH...not too bad at all
