Mack NM 6-ton 6x6 truck
The Mack NM 6-ton 6x6 truck, officially "Prime Mover Cargo truck (G-535)", was Mack's first military 6x6. It debuted as a prime mover in 1940, and was used for towing AA guns, and ammunition. Gun crews rode in its canvas covered bed. The NM's enclosed cab came from the commercial L-model. Many NM's were used by the British as recovery vehicles. Technical data. Overall Dimensions: * long * wide * tall Weight: Engine: Mack EY ohv inline 6 cyl. gasoline engine with at 2100. Gearbox: Mack TR36 5-speed direct-top Transfer  Case: Timken-Detroit 2-speed T77 with 2.55 low Wheelbase: Tires 9.75-22 (NM-1, -2, -3 Lee commercial with highway tread) Models. The NM-1 and NM-2 had an amidships mounted winch with a capstan head. It had a short steel cargo body long and wide. The cargo body had troop seats, a canvas cover, and a spare wheel on the front right side. NM-2 had smaller head lamps and parking lamps on top. The NM-3 was the last model to have an enclosed cab. It was similar to the NM-1 and NM-2 except for: front pintle for positioning artillery pieces , arched bumper (front pintle under the arche), smaller brush guard, side lights on mudguards, towing hooks on bumper deleted, radiator shell with Mack nameplate. There was no NM-4, the prototype NN-2 did not go into production. The NM-5 and NM-6 had a soft top cab with folding windscreen. It had a wooden cargo body with two spare tires at the front right and left. They had some technical detail changes. The only differences between the NM-5 and NM-6 were rifle brackets in the cab and jerrycan holders left of the winch for the NM-6. NM-7 and NM-8 were like the  NM-5 and NM-6. There were only minor detail modifications. Some were equipped with the gun-carriage brake cylinder: this was an air-cylinder from Hanna for the simultaneous actuation (cable operated) of the air brakes of the truck and the mechanical brakes of the gun.