Cat 6 Cylinder Ultra Low Sulfur Diesel Engine, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Eaton Fuller Automated Transmission, Differential Lock, 12000 lb Front Axle, 40000 lb Rears, Spicer RS405 Drive Axles, 3.36:1 Axle Ratio, 52000.0 lb GVWR, Air Ride Cab, 295/75R22.5 Front Tires, 295/75R22.5 Rear Tires, Air Ride Suspension, 415 mm Wheelbase, Dual Fuel Tanks