It sounds as if you need to do some adjusting. Those 66 series tractors should shift pretty well if everything is tight and adjusted properly. The first thing you need to do is pull the cowl right in front of the dash off. This will let you inspect all of the shifting linkages. Start at the top and work your way down replacing anything with any slop in it. You may have to even pull the range trans cover and replace some stuff in there. After all of that is done then you need adjust your trans brake and dump valve. The Tractor Vet can walk you through that procedure. I did my 1256 a year ago just like he told me and it shifts much, much better now. It maybe doesn't shift quite as good as he said it would be he wasn't here to do it himself so I might have not done something quite right. I replaced all of the linkages from top to bottom too. I didn't end up pulling the trans cover because that part of it seemed really good. Of course all of this will be a lot harder if these tractors have cabs. I sure wouldn't waste my time and money trying to put some after market thing on there.
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