Detroit Series 60 6 Cylinder 14.0 L Diesel 515 hp Engine, 2006 US EPA Label, Air Conditioner, Cruise Control, Eaton Fuller 10-Speed Manual Transmission, Differential Lock, 12000 lb Front Axle, 40000 lb Rears, 52000 lb GVWR, Air Ride Cab, 11R22.5, Air Ride Suspension, 171 in Wheelbase, Air Sliding 5th Wheel, Dual Fuel Tanks