Cummins ISX15 450ST 6 Cylinder 15.0 L Diesel 450 hp Engine, 2010 US EPA Label, CARB Compliant, Requires Diesel Exhaust Fluid, 21642 Engine hrs, Engine Brake, Eaton Fuller 18-Speed Transmission, Double Differential Locks, 12000 lb Front Axle, 40000 lb Rears, 52000 lb GVWR, Air Ride Cab, 63 in Mid Roof Sleeper Cab, Aluminum Wheels, 11R22.5, Air Trac Air Ride Suspension, 244 in Wheelbase, Wet Kit, Air Sliding 5th Wheel, Headache Rack, Dual Fuel Tanks