1990, MACK RB688S 10 WHEELS TRUCK, 607000 Km.MACK RB688S Truck Motor: E7 A Rod 400 hp; Transmission: 18 speed; Axles: 12/44 Eaton; Axle spread: 54"; Differential: Mack; Wheel Base: 202"; Wheels: 22.5 Spock; Tires: 11x22.5 50%; Suspension: Air Hendrickson.