The most common ones are Heisler and Behlen, although I have not seen a Behlen on a 12 or 14. Not saying Behlen didn't make one, I just have not seen one. Heisler made overdrives for all the f series tractors. Unlike the Behlen overdrive which gave you a road gear the Heisler sped up all the gears turning a four speed into a eight speed. It also sped up the pto and belt pulley too.
Heisler units sell for around $500. Sometimes they are on ebay. Be careful in what you buy as the 12 and 14 have a different transmission input gears and the Heislers are specific to the 12 or 14. They do not interchange.
Here is a heisler on one of my f20's
This post was edited by 36F30 at 15:59:06 08/29/10 2 times.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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