The M-813 5-speed cargo truck.

 M-813 Cargo General Specs

Vehicle M813 Cargo
Manufactured by AM General
Wheel base 179 inches
Tire Size 1100X20, or 1400X20
Steering Ross Power, HP 70 series
Weight (curb) Cab and Chassis 22,500 lb
Engine Cummins NHC 250, Naturally Aspirated
Horsepower 250 to 300
Transmission Spicer 5 speed, Synchromesh, Model 6353
Transfer Case: Rockwell 2 speed, Model T-138
Axles Rockwell Double Reduction, Front 18,000 lbs, Rear 44,000 lbs
Differentials Ratio 6:44/1
Electrical System 24 Volt, negative ground, 60 Amps
Brakes Air/Hydraulic
Fuel Capacity 80 Gallons