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This is a New IPTO Drive Gear / Shaft for IH Farmall tractors 1566 and 1568. This gear has 1 7/8" 18 spline and 26 gear teeth 25 degree. You must specify your tractor model and serial number. send email to schmittfarmserv@wwt.net This is a NEW gear not a used gear with new splines welded on. I also have carriers and gears available for other applications along with release bearings and other clutch and PTO components Check out my store for other IH parts. I have over 25 yrs. experience of rebuilding IH tractor and motors and have many parts available . Email your questions and I can probably help you.