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1955 C1B Overdrive Tranny?


Fibonachu

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I picked up a 55 C1B a couple weeks ago and have been spending my time cleaning things up and checking it out.  In poking at it, I discovered a knob on the dash marked overdrive with wiring that goes down to the transmission.  I have been trying to find some info on what this might be and the only thing I can find is an article on allpar.com about how 3-speed transmissions with electric overdrive were briefly offered on the C trucks.

 

Does anyone know what this transmission was called or where I might find more info about it?  Is it particularly uncommon?  None of the gearheads I hang out with have ever heard of such a thing, but most of them are not Dodge people.

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The OD was a standard R-10 car 3 speed .

Worked on one in a 55 back around 1981.

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