My father used to have a 1977 7-ton Bedford truck made in England. Cool truck with a 6 inline cylinders. Anyway, that truck and many others in my country (Fords, especially) have a special low gear which you engage via an electrical switch. There was an electric motor (the size of a wiper motor) bolted to the third member that moved a lever from one side to the other and voila, you were in low gear. I'm not sure how much, but it felt like 1.5:1ratio. Anybody seen those? Is there something similar for our axles? Just curious.