All States Ag Parts Crankshaft Dampener John Deere 4020 4010 4000 AR58172 Fits John Deere Tractor(s) 4000 (diesel), 4010 (diesel), 4020 (diesel) Replaces John Deere OEM nos AR58172, AR50392, AR58181, R34364, AR26381 Single groove without air conditioning For a Used version of this sku use 499866 All new, rebuilt and used tractor parts have a 1-year warranty