Been trying to work out why gearboxes and driveshafts and diffs are still used, especially on 4x4s, with the addition of a transfer gearbox and driveshafts at both ends. Whats wrong with an engine mated to an electric generator feeding two or four electric motors at the wheels, So much simpler , yet not utilised, unless you own a train. electric motors give max toroue from 0 revs too, just vary the engine speed depending on power requirments .