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What is the industry standard size/spline (if there is one) on 1000 rpm PTO? What I am seeing on my web shopping is 1-3/8 Diameter is 21 spline and 1-3/4 diameter is 20 spline. Is this correct? Is it basically industry wide? I have the chance to buy a large quantity of N.O.S. shaft assemblies and don't want to end up with something I can't sell.
 
I twisted off the small 1000 shaft on a MF 2805 running at 230 HP, right were it comes out of the tractor. Only the large shaft was recomended for that 190 stock HP Tractor.
 

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