DESCRIPTION 1985 Mack R686ST Truck (DR12624 Unit 72), Mack diesel engine, manual transmission, tandem axle full screw, Mack rears, 191'' WB, engine brake, 22.5 tires. Serial Number: 2M2N179Y3FC096336 Notes: The engine of the truck was rebuilt in 2020 and has less than 5,000 miles since. Call seller for more details.