That transmission was also used in many Ford and other brands and I had one in my 1950 Mercury when I was a teenager. If you floor the gas pedal the pedal should engage a switch under the pedal and kick the transmission out of OD.The overdrive in cars of those years was different that that of today as it was electrically controlled rather than a gearshift position. Clean the base of the shifter with a rag and. Rotate the shifter base 180 degrees so that it is oriented toward the front. Remove the six bolts that hold the shifter plate to the top of the transmission case, and remove the shifter base from the transmission. You can engage the OD unit in all three gears but first is a challenge to get to 35MPH or so. For a 1955-57 installation, the shifter base must be moved to the forward position. Also, this is a free wheeling transmission so when you let off the gas the car would coast. The Tach should drop in RPM when you do this. I have ordered the gasket for the differential and the gasket and filter for the transmission (automatic transmission). I intend to change the fluids in the differential and transmission. That is done by accelerating a little until you are over abt 35mph, letting off the gas pedal and you should feel it sort of clunk or engage. BudP said: I am the second owner of a 57 TBird with 48,000 original miles. When the cable and underdash handle is pushed fully forward the OD unit can be activated. Second, those are electric shift OD units. That is done via an underdash handle that goes to the back of the tranny. First there should be a lockout cable that allows you to de-select the OD. However the OD tranny is pretty distinctive. Tezza-I sold the one I restored a couple years ago.
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