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.
just so ya know, 4th is the stongest gear in the trans.
