Fits Allis Chalmers 426 Crankshaft Remachined M2/01 Rods & Mains 6 Cyl Diesel 4025042, 4027134, 4028608, 4025479, 4035953, 4028603, 4036404, 4037168, 4036264, 4037190, 39CR5 3400, 3500, 3700, 3750, 670T Standard Duty Small pitting on #1 and #2 Mains aswell as #1 Rod will not affect performance, * Stroke: 5.000" * Rod Journal: 2.748" * Main Journal: 3.248" * 7 Mains * With Helical Gear