The John Deere G was introduced in 1937 above the model A. In fact, the power class was the same as the model D, but in its early years, the G was always a row-crop tractor equipped with wide front wheels. It was over 500 kg lighter than the model D. The engine was large in displacement (6.8 liters) and a slow-running two-cylinder; fuel options included, among others, gasoline. With its 34 horsepower, it was promised to pull a 3 x 14" plow. It had 4+1 gears, and unlike the smaller models, these were operated with a single gear lever.

The smaller models were redesigned already in the late 1940s, but the G had to wait until 1942 for a modern appearance. At that time, it also transitioned to a 6+1 transmission, and electric start and lights were added as optional equipment. At this stage, the G was known by the designation GM, because due to wartime price controls, the price could not be raised, but by changing the designation, the updated model became a different product, allowing a price increase. In 1947, a wide front axle was also offered. That same year, a padded seat with a separate backrest was introduced, and electric start became standard equipment.

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