Machine description: Mack EM7 6 Cylinder Diesel 300 hp Engine, 1995 US EPA Label, Manual Transmission, 425/65R22.5 Front Tires, 11R22.5 Rear Tires, Dual Steering Boxes, Double Frame, Spring Suspension, 270 in Wheelbase, P... more info about the 1995 Mack RD690S.