Detroit DD15 6 Cylinder 14.8 L Diesel 455 hp Engine, Air Conditioner, Cruise Control, Power Windows, Exhaust Brake, Detroit Automated Transmission, 12350 lb Front Axle, 40000 lb Rears, 2.64:1 Axle Ratio, 52350 lb GVWR, Air Ride Cab, 72 in High Rise Sleeper Cab, Bunk Beds, Aluminum Wheels, 275/80R22.5 Front Tires, 295/75R22.5 Rear Tires, Airliner Air Ride Suspension, 229 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks