The 1566 had a DT436, I'd guess the 1586 did too. The gears are helical cut in the 15's instead of straight cut like in the smaller models. They also don't slide the gears, they have a synchronizer-type set-up, a coller slides over a set of dogs on the gears to engage them. A wider collar on the 2nd gear would help a 1566, as it was hard to find 2nd sometimes. I don't know if a 1586 uses the same part or not.
They are not a good haying tractor. The step from 1st to 2nd gear is bigger than the 4 speed tractors. If you run a diskbine with it you can easily be too fast or too slow. They are good for the chopper but that's the only thing we did with ours besides tillage.
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Today's Featured Article - Pop's Tractor of Gold - by Gary Teate. My father was a simple man but could repair just about anythin mechanical that was ever made. From the time I was a young boy growing up in Jacksonville, Florida, I would spend a considerable amount of time helping my father repair or rebuild equipment and engines, etc. on our 2 1/2 acre "spread". Pop always dreamed of having more acreage out in the country where he could retire and tinker as much as he wanted and often reminisced about his boyhood days on his grandfathers farm in Montecello,
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