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5-ton 6x6 truck
The 5-ton 6x6 truck, officially "Truck, 5-Ton, 6x6", was a class of heavy-duty trucks used by the US Armed Forces. The basic cargo version was designed to transport a 5-ton (4,536 kg) long cargo load off-road in all weather. In on-road service the load weight was approximately doubled. Through three evolutionary series (M39, M809, and M939) there have been component improvements, but all trucks were mechanically very similar. They were the standard heavy-duty truck of the US military for 40 years, until replaced by the Medium Tactical Vehicle (MTV) beginning in 1991.
== History ==
In 1949 the Army set a requirement for a 6×6 off road truck to replace World War II 4 and 6 ton 6x6’s built by Brockway, Diamond T, Mack, and White with a single standardized chassis. International Harvester and Mack submitted designs, the International design was selected. Because of the Korean War it was rushed into production 1951, before it was standardized in 1953. Soon Kaiser also became a major manufacturer, with Diamond T and Mack building smaller numbers. In 1963 Kaiser-Jeep began building the final order, production was completed in 1965.
The M39 series originally had a gasoline engine, then were upgraded with diesel, then multifuel engines, with mixed results. AM General (successor of Kaiser-Jeep) developed an updated version of the M39 series. Standardized as the M809 series, the primary difference was the engine. The hood and grille were lengthened to make room for the larger engine, and the lighting system was updated to meet new US safety regulations. All had an air cleaner on the left front fender, a way to tell them from the earlier M39 series. AM General built all M809s between 1970 and 1982.
The M939 series was a Product Improvement Package of the M809, with updated engine, transmission, and brakes. A new, larger cab and tilt-forward hood were a major visual change from earlier trucks. In 1982 AM General began production of M939s.}
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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