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The basic truck is a 6×6 (three axles, six wheels, all of which are powered) heavy truck. Early M939s were rebuilds of M809 vehicle chassis with a new automatic transmission, transfer cases, cab, and hood. Suffix –A2 are new production with later model Cummins engine. The vehicles have a wide variety of configurations and weights. [4] [6] [7]
Six-wheel drive (6WD or 6×6) is an all-wheel drive drivetrain configuration of three axles with at least two wheels on each axle capable of being driven simultaneously by the vehicle's engine. Unlike four-wheel drive drivetrains, the configuration is largely confined to heavy-duty off-road and military vehicles, such as all-terrain vehicles ...
The wheel options go by 18-inch, 20-inch, or 22-inch aluminum-alloy wheels (styled steel for base Tradesman models), depending on the trim level selected. Like Ford/GM (especially) trucks and unlike all prior generations, this marks the first time 6-lug patterns are now used since the first and second generation Dakota mid-size truck.
Each 797 wheel is attached to the axle using 54 - 36 mm (1.4 in) nuts that are torqued to 2,300 lb⋅ft (3,118 N⋅m). [15] A size 55/80R63 radial tire was developed by Michelin in conjunction with Caterpillar specifically for the first generation 797. [ 16 ]
The vehicle is named the Suburban Shield and was known as the Heavy-Duty Sport Utility Vehicle (HD SUV) during development. [166] It is offered in 1LT and 2LT trims with 4WD and the L87 6.2L V8 engine and 10-speed automatic transmission standard; the 3.0L Duramax I-6 turbodiesel is an option. [ 167 ]
Rear axles for the light-duty 2500 trucks were semi-floating, while the heavy-duty 2500 rear axles were full-floating. Light-duty 2500 trucks shared the frame with the 1500, were only available in regular cabs in two- or four-wheel drive, and were equipped with either the 5.2L or 5.9L V8 engine. All Ram 2500s and 3500s had eight-lug wheels.
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