The box I have is a 6031B and it seems too large and heavy you will also have to consider the input and out put shafts and the availability of yokes and U-joints that will adapt to what you have. Other than the size of the yokes on mine it is probably usable but still heavier than I would like. Spinning big gears eats horse power and shear weight eats up payload and both fuel mileage, it would be counter productive to use a box that eats up more than it saves.
