Cummins ISC 6 Cylinder 8.3 L Diesel 300 hp Engine, Exhaust Brake, Eaton Fuller RTLO-11610B 10-Speed Manual Transmission, 12000 lb Front Axle, 21000 lb Rears, 4.11:1 Axle Ratio, 33000 lb GVWR, Aluminum Wheels, 11R22.5, Low Air Leaf Air Ride Suspension, 256 in Wheelbase, 26 ft x 102 in Bed, Dovetail, Manual Ramps