1981 John Deere 8640 4WD Tractor, 7,900 Hrs Showing, 275 Hp, John Deere 10.1L 6-Cyl Diesel, John Deere Quad-Range, Partial Powershift, 16 Forward Speeds, 6 Reverse Speeds, Small 1000 PTO, Rear PTO Location, 2 Auxiliary Hydraulics, 18.4-38 Front Tires, 18.4-38 Rear Tires, Front And Rear Duals, Quick Hitch, NOTE: Engine Turns Over But Would Not Start, Seller States Engine Has Blown Head Gasket-call Seller For Details, SN: 8640H005809RW