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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.
John Deere introduced at least 38 new tractors during the 1980s during a time when at least 3 other competitors merged, were sold or went out of business altogether: 1  Two new small compact diesel tractors were added in 1981.