D13H455 6 Cylinder 12.8 L Ultra Low Sulfur Diesel 455 hp Engine, 2012 US EPA Label, Requires Diesel Exhaust Fluid, Air Conditioner, Cruise Control, Power Windows, Engine Brake, ATO2612D 12-Speed Automatic Transmission, Differential Lock, 12350 lb Front Axle, 38000 lb Rears, Meritor MT-40-14X Drive Axles, 2.64:1 Axle Ratio, 50350 lb GVWR, Air Ride Cab, 60 in High Rise Sleeper Cab, Aluminum Outer Wheels, 295/75R22.5, Air Ride Suspension, 214 in Wheelbase, Air Sliding 5th Wheel