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In the late 1970s the M809 series 5-ton (4,536 kg) 6x6 trucks, based on a 1949 design, were becoming old and mechanically dated. It was still a useful type, with 35,000 in service. A "Product Improvement Package" was developed to rebuild and update the M809 series into the M939 series.
M54 (M39 series) M813 (M809 series) M923 (M939 series) The 5‑ton 6x6 truck , officially "Truck, 5-ton, 6x6", was a class of heavy-duty six-wheel drive trucks used by the US Armed Forces . The basic cargo version was designed to transport a 5-ton (4,500 kg) load over all roads and cross-country terrain in all weather.
The M39 series was the primary heavy truck of the U.S. Army and U.S. Marine forces during the Vietnam War, and was also used by the U.S. Navy, U.S. Air Force, and ARVN forces. [2] 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 ...
The M809 Series 5-ton 6x6 truck was a family of heavy tactical trucks built for the United States Armed Forces. 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. In on-road service the load weight was doubled. Built by AM General, they evolved into the M939 Series.
6-ton 6x6 [10] 1941–1945: 219,882: Bridge, crane, cargo fire, van and others by 5 manufacturers Mack NM 6-ton 6x6: 1940–1944: 8,400+ Prime mover cargo truck Mack NO 7 + 1 ⁄ 2-ton 6x6: 1943–1945: 2,050: Prime mover cargo truck M1 Wrecker 10-ton 6x6 [11] 1941–1945: 5,765: Standard heavy wrecker during WWII Built by Ward LaFrance and ...
A 5-ton 6×6 truck produced by AM General as a replacement for the M39 series; at least 38,000 were produced in a number of variants. [7] AM General M939 series: 5-ton truck 6x6: 1982 A 5-ton 6×6 truck produced by AM General as a product-improvement of the M809 series; at least 25,000 were produced in a number of variants. [8] Austin K2/Y: 2 ...
M939 5-ton 6x6: NH250 [6] 855 cu in (14.0 L) D: I6: 240 hp (179 kW) @2100rpm: 685 lbf⋅ft (929 N⋅m) @1500rpm: M809 5-ton 6x6), M939 5-ton 6x6: NTC400 [7] 855 cu in (14.0 L) D: TC I6: 400 hp (298 kW) @2100rpm: 1,150 lbf⋅ft (1,559 N⋅m) @1500rpm: M915 series 6x4, 6x6, 8x6: V8-300 [8] 785 cu in (12.9 L) D: V8: 300 hp (224 kW) @3000rpm: 580 ...
M809 series 5-ton 6×6 truck; M816 Wrecker; M877; M915 (truck) M939 series 5-ton 6×6 truck; M970; M1151; M1288 GMV 1.1; Mack AC; Mack model EH trucks; Mack NJU 5-ton 4x4 truck; Mack NM 6-ton 6x6 truck; Mack NO 7½-ton 6x6 truck; Mack NR; Mack Trucks in military service; Medium Tactical Vehicle Replacement; Militor truck