One fewer gear in the speed transmission allowed IH to make the remaining gears heavier to deal with the additional horsepower.
Planetary final drives, and heavier axles were added as well.
The classic 4-speed, 2-range, TA transmission was only designed for the horsepower that an 806 could put out, around 95HP. It just wasn't built to take 140+ HP, and there were a lot of transmission problems on the '66 series because of it. Wasn't as bad as the 560 fiasco, but then again, there were a lot fewer '66 series tractors than '60 series.
I guess part of the justification for having fewer gears was, the tractor has so much horsepower, you just bull your way through instead of matching ground speed to available power.
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Today's Featured Article - The Fordson F Ignition System - by Anthony West. A fellow restorer contacted me earlier this year asking for some help and advice on a model F that he was restoring. He had over a period of months spent a fair amount of his hard earned cash on replacement parts for the old "trembler" ignition. Sadly though all his efforts seemed to be a waste of time and money as he still couldn''t get the temperamental old thing to run correctly!! If i said that this was a little frustrating for him that would be "conservative" in fact the problem had reduce
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