Detroit Series 60 6 Cylinder 12.7 L Ultra Low Sulfur Diesel 425 hp Engine, 2006 US EPA Label, 12456 Engine hrs, Eaton Fuller FRO-14210C 10-Speed Manual Transmission, 12000 lb Front Axle, 20000 lb Rears, Meritor RS-23-161 Drive Axles, 3.73:1 Axle Ratio, 32000 lb GVWR, Air Ride Cab, 275/70R22.5 Front Tires, 295/80R22.5 Rear Tires, Airliner Air Ride Suspension, 161 in Wheelbase, Dual Fuel Tanks