Hard to say, the only thing 3rd and 4th have to do with the input shaft is the 4th and 5th sliding gear locks on to the input shaft for 5th gear. When 3rd and 4th speeds are changed in those transmissions the 3rd and 4th drive gear on lower shaft is changed along with the 2&3 and 4&5 slider gears on upper shaft. Faster 3&4 can come from W-6, I-6, old aftermarket or new gears made, or something I haven't heard about. IH made a faster 4th for M tractors. Faster input and constant mesh gears would speed up all gears.
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Today's Featured Article - On the Road with Dave Gohl: Tractor Club Beginnings - by Dave Gohl. I was surprised about a month ago when I got a call from a fellow tractor croonie. His message was interesting and to the point. He's says "Dave, I've been thinking about starting a Two Cylinder club for our area. What do ya think?" It was a loaded question. I said that I would be interested, and was wondering what his next step was. (Although I was talking under my breath, since I thought of this some years ago) My friend, Arlyn Lamb of Lakeville, Minnesota was sincere in his miss
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