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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 1935 the smaller model B John Deere tractor, a version of the A, went into production to meet the needs of smaller farms. These tractors were so successful, as a row crop tractor, that a larger version seemed to be just the tractor that would fill a nitch in an area of the larger farms.