Cummins ISX 435ST 6 Cylinder 15 L Diesel 435 hp Engine, 2007 US EPA Label, Engine Brake, Eaton Fuller 10-Speed Manual Transmission, Air Ride Cab, 275/80R22.5 Front Tires, 295/75R22.5 Rear Tires, Air Ride Suspension, 153 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks