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In 1949 the US Army set a requirement for a family of extra heavy-duty 10‑ton (9,072 kg) load rated, off-road, 6x6 tactical trucks. Mack's design, influenced by their WWII era NO (7 + 1 ⁄ 2-ton, 6x6 truck), was chosen.
The Dana/Spicer Model 80 is an automotive axle manufactured by Dana Holding Corporation and has been used in OEM heavy duty applications by Chevrolet, Dodge, and Ford.It can be identified by its straight axle tubes, 10 bolt asymmetrical cover, and a "80" cast into the housing.
The Cummins M-series engine is a straight-six diesel engine designed and produced by Cummins.It displaces 10.8 litres (659.1 cu in).Introduced as the M11 in 1994, it was built on the previous L10 engine (same 4.921 inches (125.0 mm) cylinder bore, but a longer 5.787 inches (147.0 mm) piston stroke compared to the L10's 5.354 inches (136.0 mm) stroke).
Cummins V8-300 (right rear) Detroit Diesel. Model Displacement Fuel Type Power Torque Used in 3-53: 159 cu in (2.6 L) D: SC I3: 103 hp (77 kW) @2800rpm:
Cummins NH250 engine Cummins 6CTA8.3 diesel engine M939 chassis with dual rear tires M939A1 and A2 have single rear tires. All models of the M939 share a common basic chassis, cab, hood, and fenders. The basic truck is a 6×6 (three axles, six wheels, all of which are powered) heavy truck.
In 1949 specifications were set and truck manufactures began working on prototypes. Chrysler, GMC , and Mack's designs were advanced, International Harvester 's was a conservative conventional, similar in size and layout to the earlier 6-ton (G512) series.
Cummins Interact 6.0-EURO III (Turbo Intercooler) 184 @ 2500 950 @ 1200 - 1700 Eaton FS-6306-B Manual Synchromesh 6 Speed 16000 35000 24.220 Cummins C8.3215 P5-0-EURO III (Turbo Intercooler) 160 @ 2200 888 @ 1400 Eaton FS-6306 A Manual Synchromesh 6 Speed 23000 35000 24.250E Cummins Interact 6.0-EURO III (Turbo Intercooler) 184 @ 2500
The F Model offered 5 different diesel engines, Mack's Maxidyne and Thermodyne at 260-375 hp, Cummins - 250-350 hp, Detroit Diesel - 270-430 hp and Caterpillar - 325 hp. Cat3406 is a big-bore diesel available in both high-torque-rise and conventional torque-rise versions; Detroit Diesel 71 series, provided power with a high torque curve.