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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.
The year 1940 marked the beginning of two changes meant to improve the functionality of the John Deere Model A. During this time, the size of the engine was increased from 309 cubic inches to 321 cubic inches in an effort to make it more powerful.