though i do agree that duals are better in this application, but i'll play devil's advocate and ask has anybody ever thought of just using a higher gear in their tranny with a single case? it's not like you're locked in 1st gear when in low range
With 33 inch tires, 4.88 gears, and 4.7 low range my truck runs about 19 mph at 4,000 rpm. Most of the time it is OK, but the higher transmission gears are not always designed for the same amount of torque as the lower gears, espectially overdirve (5th). Having a single 4.7 is way better than stock, but having more options would be better.
