The 1930s and 1940s saw a large number of different John Deere models emerge, as small farmers emerging from their Depression troubles increasingly turned from horses to tractors. Deere & Company's GM model was introduced in 1942, and was made until 1947. Engine power was increased to , and a new six-speed transmission was also added. The G model got a restyled front at this point, as did the other John Deere tractors models. The GM had electric start and lights added to its options. During its production time, the G tractor was available in hi-crop and single front wheel versions. The G was restyled in 1941, but did not start to roll off the assembly line until early 1942. Like the smaller A and B tractors, the G model had the six-speed transmission added to it. In 1946, the 1946 model "D" had a engine, which was enormous for the day. Two new additions to the tractor line, the M and R models, were also added.