John Deere 4.254, 4.270 Early OEM Crankshaft Remachined 10/10 Rods & Mains 4 Cyl Diesel AR26428, R40570, R26540 4.270 ESN up to 280000. Includes balancer driver gear. No Nose Gear * Flange: Flat, 4 Bolt Holes, 2 Dowel Holes * Snout: 1 Bolt Hole, 2 Key-ways * Stroke: 4.750" * Rod Journal: 2.9980-2.9990" * Main Journal: 3.3715-3.3725" * 5 Mains * With Helical Gear