Cummins ISM 6 Cylinder 10.8 L Diesel 370 hp Engine, 1999 US EPA Label, Engine Brake, Eaton Fuller RTLO-14610B 10-Speed Manual Transmission, 12000 lb Front Axle, 20000 lb Rears, Meritor TR8670 Drive Axles, 3.91:1 Axle Ratio, 52000 lb GVWR, Air Ride Cab, 60 in Flat Top Sleeper Cab, Aluminum Wheels, 285/75R24.5, Airliner Air Ride Suspension, 236 in Wheelbase, Headache Rack, Dual Fuel Tanks, Gooseneck Ball Hitch