Cummins 661 cid Diesel 400 hp Engine, US EPA Label, Air Conditioner, Cruise Control, Eaton Fuller 10-Speed Manual Transmission, 18000 lb Front Axle, 40000 lb Rears, 4.63:1 Axle Ratio, 58000 lb GVWR, 315/80R22.5 Front Tires, 11R22.5 Rear Tires, Walking Beam Suspension, 260 in Wheelbase, PTO, Double Frame