Cummins ISX15 6 Cylinder 15.0 L Diesel 525 hp Engine, 2011 US EPA Label, Positive Air Shutoff, Engine Brake, Eaton Fuller 18-Speed Manual Transmission, Double Differential Locks, 12000 lb Front Axle, 40000 lb Rears, 52000 lb GVWR, Air Ride Cab, 48 in Mid Roof Sleeper Cab, Aluminum Wheels, 11R24.5, Low Air Leaf Air Ride Suspension, 242 in Wheelbase, PTO, Air Sliding 5th Wheel, Dual Fuel Tanks