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The John Deere model GP was built in five distinct versions through the course of its production: 1  The standard-front GP, or John Deere Standard, built from March 1928 to February 1935. 2  The John Deere two-wheel tricycle-front GP, or GP-tricycle, of which twenty-three units were built between August 1928 and April 1929.
In late 1937 the front frame was lengthened so that the Model B could share some integral implements with the Model A. From this point on, the tractors were referred to as Long Frame as opposed to the previous Short Frame. All of the John Deere two cylinder tractors at this time were designed to run on tractor fuel or distillate. This was less volatile than gasoline, so the tractors had a small gasoline tank located behind the main fuel tank, for starting the engine.