Cummins ISX15 6 Cylinder 15.0 L Diesel 550 hp Engine, 2013 US EPA Label, Engine Brake, Eaton Fuller RTLO-18918B 18-Speed Manual Transmission, Triple Differential Locks, 16000 lb Front Axle, 57000 lb Rears, Meritor RZ-69-166 Drive Axles, 4.30:1 Axle Ratio, 73000 lb GVWR, Air Ride Cab, Aluminum Wheels, 11R24.5, Airliner Air Ride Suspension, 274 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks, Hour Meter Reads 21396