John Deere 404, 6.404 Late OEM Crankshaft Remachined ST/ST Rods/Mains 6 Cyl Diesel R56934, R40740 Late 6.404 engines with flywheel flange that has centering ring and 4 threaded bolt-holes. Cam driven Oil pump (no Rear gear) | Flange: Centering Ring, 4 bolt holes, Lip seal | Snout: 1 bolt | Stroke: 4.75 in | Rod Journal: 2.999 in | Main Journal: 3.372 in | 7 Mains | With Helical Gear