Machine description: Mack 6 Cylinder Diesel Engine, 2443 Engine hrs, Eaton Fuller Manual Transmission, Differential Lock, 425/65R22.5 Front Tires, 11R22.5 Rear Tires, Rubber Suspension, 183 in Wheelbase, 14 ft 8 in Long x... more info about the 1987 Mack DM688S.