You won't find an aftermarket gear set. I spent a lot of time looking, and I know where to look.
What you will find, are good used gears, and some new available. I wish I could remember who it was who built the attachments for IH, but I don't. Whoever it was, built them for others too. The John Deere 33 tiller was made by the same company, as was their snow thrower. Both use the same gearbox. Again, you have to watch the ratio, as they differed from the IH set. That I am aware of, there are at least 3 different gear sets out there. As I recall, Deere can get the small gear still, but it's expensive. Interestingly enough, IH used the same gearbox on the Cyclo Air planters to drive the seed drum. But it is NLA. I'm betting there are other applications of that gearbox that I have yet to find.
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