Cummins ISX15 6 Cylinder Ultra Low Sulfur Diesel 400 hp Engine, 2015 US EPA Label, Air Conditioner, Cruise Control, Power Windows, Engine Brake, Eaton Fuller 10-Speed Manual Transmission, 12000 lb Front Axle, 40000 lb Rears, 50000 lb GVWR, Air Ride Cab, Aluminum Front Wheels, 11R22.5 Front Tires, 11R22.5 Rear Tires, Air Ride Suspension, 156 in Wheelbase, Air Sliding 5th Wheel