DESCRIPTION 1999 Mack Dry Truck (DR12140 Unit 767), Mack diesel engine, 13 speed transmission, tandem axle full screw, air ride suspension, Willmar 1600 stainless steel hydraulic dry tender box, rear discharge auger, roll over tarp, engine brake, cab heat/air conditioning, 24.5 tires, aluminum wheels. Serial Number: 1M1AA18Y0XW104996 Notes: