My 1978 mack 688 is for sale. It has a 300 engine, double frame with no cracks. 6 speed maxidine transmission,44k rears drag axle, knuckle boom. The truck is in great working condition. I have just changed the oil, and all but one of the tires are in very good condition. The price is 9,000$ . my phone number is 606 574 1404 after 4 pm, or you can p.m. me.