![]() The -A1 upgrade had a Mack ENDT-673, a 673 cu in (11.0 L) turbocharged inline 6 cylinder diesel engine developing 210 hp (160 kW) at 2100 rpm. The M39 series were originally powered by a Continental R6602 engine, a 602 cu in (9.9 L) overhead valve inline 6 cylinder gasoline engine developing 224 hp (167 kW) at 2800 rpm. The M809 Series was then improved into the M939 series. The M39 series evolved into the M809 (G908) series in 1969, which followed, but did not replace, it. Rushed into production by International Harvester in 1951, soon Kaiser (renamed Kaiser-Jeep in 1963) also became a major manufacturer, with Diamond T and Mack building smaller numbers. The M39 (G744) series was designed as a 5-ton (4536 kg), three-axle all-wheel-drive off-road truck to replace World War II-era trucks such as 4- and 6-ton 6×6s built by Brockway, Diamond T, Mack, and White. The M39 Series began to be replaced by the M809 series in 1970, followed by the M939 series in 1982, but continues to serve in other nations' armed forces around the world. Marine forces during the Vietnam War, and was also used by the U.S. The M39 series was the primary heavy truck of the U.S. ![]() In on-road service the load weight was doubled. The basic cargo version was designed to transport a 5-ton (4,500 kg), 14 ft (4.3 m) long load over all terrain in all weather. The M39 series 5-ton 6×6 truck (G744) was a family of heavy tactical trucks built for the United States Armed Forces.
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