Cummins ISX15 450ST 6 Cylinder 15 L Ultra Low Sulfur Diesel 450 hp Engine, 2015 US EPA Label, Requires Diesel Exhaust Fluid, 25856 Engine hrs, Engine Brake, Eaton Fuller 9-Speed Manual Transmission, 13200 lb Front Axle, 38000 lb Rears, Dana R40-145 Drive Axles, 51200 lb GVWR, Air Ride Cab, 70 in Mid Roof Sleeper Cab, Bunk Beds, Bunk Heater, Aluminum Wheels, 295/75R22.5, Air Ride Suspension, 244 in Wheelbase, Air Sliding 5th Wheel, Headache Rack, Dual Fuel Tanks