How common was the Sherman transmission in a TO-30?
The Sherman was probably the most often used overdrive or over/underdrive used. The other two you see are the Hupp and the F&T but, the F&T is pretty rare. These auxiliary transmissions were more common in the Ford 9N and 2N because they only had two working gears. The 4 speed in the TO-30 as well as the TO-20 provided a good range of working gears,’ Sherman also made a Live Power Take Off transmission for the TO-30. A creeper gear or underdrive transmission and a shuttle transmission was popular on loader tractors because you could move forward and back at the same speed.