Detroit Series 60 6 Cylinder 14.0 L Diesel 515 hp Engine, 2005 US EPA Label, Engine Brake, Eaton Fuller RTLO-16918B 18-Speed Manual Transmission, Double Differential Locks, 48 in Flat Top Sleeper Cab, 11R24.5 Front Tires, 11R24.5 Rear Tires, Air Ride Suspension, 228 in Wheelbase, Air Sliding 5th Wheel, Headache Rack, Dual Fuel Tanks