Heavy Duty Trucks - Cab & Chassis Trucks, Tandem Axle, VIN# 1M2K195CXXM015634 Make Mack Model Year 1999 Model MR688S Engine Manufacturer MACK E7 L6, 12.0L (728 CID) Fuel Type Diesel Brake System Air CAB AND CHASSIS WALKING BEAM SUSPENSION AUTOMATIC TRANSMISSION (RY31)