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Pat: I presume this limited slip kit is an aftermarket device. In my many years of tractor use, I'd have to say these devices would give very limited advantage. I owned a few tractors with diff lock and the only advantage I saw was with front end loader hanging out front. Unless you have front end weight under greasy conditions a diff lock or limited slip will turn tractor crossways on a hard pull. On dry road conditions Farmalls will spin both wheels equally on a hard pull, providing wheel weight and tire tread are the same. I've used several 30-40 hp utility type tractors with difflock, great when you using the loader, but without loader and on a drawbar pull the wheel slipping will continue to slip and turn tractor crossways. It will get you out of a minor problem but that is about it. I had difflock on a 1066, however that one is not a gear lock up like smaller tractors, but rather a clutch device and with dual wheels it wouldn't hold. Near as I could tell it was toast before the tractor had 1,000 hours on it. Complete waste of money for that one. I also had an articulated Deere with diff lockups on both rear ends, again not a gear lock up, but much better than the 1066. Both diff locks on the Deere were still working after 13,000 hours, and they did count big time on the articulated tractor. Most articulated machines (tractors, loaders and forestry machines) today have limited slip differencials and they work well. I know you are into tractor pulling with the H, have done a bit of that myself. I presume the H is narrow front. My thoughts if you have limited slip and one side is slipping on a pull track, then it is going to continue to slip and take you off course in the length of the pull. I think pull judges frown on that. I'd spend my money making sure my tire weight and indeed tire is exactly same on both sides. The Farmall differential will do the rest.
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