Cat 3406 6 Cylinder Diesel Engine, Engine Brake, Eaton Fuller 13-Speed Manual Transmission, 12000 lb Front Axle, 38000 lb Rears, 50000 lb GVWR, Aluminum Wheels, 11R24.5, Air Ride Suspension, 265 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks