The Stovebolt Site Forums The Shop Area Driveline Granny Gear 1953 3600 - Changed for better Ratio?

There was basically one truck 3-speed and one truck 4-speed during the enclosed drive-shaft 50s years (1950-1954). All had a 1:1 ratio high gear. The SM420 four speed had a "sub low" "granny gear".

Later in the 50s (late 1955 onwards, I think) a 3-speed with overdrive was available from the factory, at least on the 1/2 tons.