Machine description: Mack EM7 6 Cylinder Diesel 300 hp Engine, 1994 US EPA Label, 24331 Engine hrs, Mack Maxitorque T2080 8-Speed Manual Transmission, Differential Lock, Air Ride Cab, 425/65R22.5 Front Tires, 11R24.5 Rear... more info about the 1994 Mack RD690S.