Cat C15 6 Cylinder Diesel Engine, Air Conditioner, Cruise Control, Engine Brake, Eaton Fuller 10-Speed Manual Transmission, 12000 lb Front Axle, 38000 lb Rears, 3.36:1 Axle Ratio, 50000 lb GVWR, Air Ride Cab, 63 in Mid Roof Sleeper Cab, Aluminum Wheels, 11R24.5 Front Tires, 11R24.5 Rear Tires, Air Ride Suspension, 264 in Wheelbase, Air Sliding 5th Wheel