All M's came from the factory as 5-speeds, and no plain Ms were built in the Louisville plant. Some SUPER M's were built in Louisville.
Two manufacturers, Heisler and M&W, built auxiliary gearboxes for the H and M which provided 4 additional speeds to fill the gap between the ~5MPH 4th gear and the ~15MPH 5th gear. Tractors equipped with these are commonly called 9-speeds.
9-speed was not a factory option, it was installed aftermarket by a mechanic at the dealer.
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Today's Featured Article - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
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