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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