I have a 1951 Farmall M with a Heisler 9 speed. It has no effect on 5th gear and adds the 4 additional gears between the standard 4th and 5th gears. Your post mentions a Heisler Overdrive and that may have been something different then the 9 speed setup on my tractor. We had a 1952 8N Ford when I was a kid that had a Sherman transmission and it in fact in high range did about double the standard 4th highway gear. I had the tractor in town one day to get new rear tires installed and picked it up after high school classes. I caught the school bus outside of town a few miles and passed it going up a hill with all the kids hanging out the windows. The bus was one of those late 1940's Chevy 6's which had to get in low gears for anything other then being on the flat or going downhill. But I believe that Ford 8N would come close to 30 mph though. It's a wonder we did survive some of the stuff we pulled as kids, Hal.
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