Detroit DD15 6 Cylinder Ultra Low Sulfur Diesel Engine, 17607.33 Engine hrs, Engine Brake, Detroit DT12-OA 12-Speed Automatic Transmission, 13300 lb Front Axle, 40000 lb Rears, Meritor MT-40-14X Drive Axles, 3.08:1 Axle Ratio, 53300 lb GVWR, Air Ride Cab, 60 in Mid Roof Sleeper Cab, Aluminum Wheels, 295/75R22.5 Front Tires, 11R22.5 Rear Tires, Air Ride Suspension, 237 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks