Cat C15 15 L Diesel 550 hp Engine, 2003 US EPA Label, Webasto Engine Coolant Heater, 1422 Engine hrs, Engine Brake, Eaton Fuller RTLO-18918B 18-Speed Manual Transmission, Triple Differential Locks, 16000 lb Front Axle, 57999 lb Rears, Dana T69-170HP Drive Axles, 4.10:1 Axle Ratio, Air Ride Cab, 40 in Mid Roof Sleeper Cab, Aluminum Wheels, 385/65R22.5 Front Tires, 11R24.5 Rear Tires, Air Ride Suspension, Air Sliding 5th Wheel, Headache Rack, Lowboy Ramps, Dual Fuel Tanks