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EFV-8 Club Forum / General Ford Discussion / 1950 ford transmission/ overdrive

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Discussion Topic: 1950 ford transmission/ overdrive

fatso2114

04-16-2019 @ 4:32 PM

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Hello, want to put over drive in my 50 ford was wondering if I need a different drive shaft ( length) or can I use the same one in the over drive trans mission thanks for the help,John

JT Ford

04-17-2019 @ 6:50 AM

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No problem with the driveshaft. It will work with Std. tranny or OD.

fatso2114

04-17-2019 @ 8:52 AM

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Thanks JT ford for the info great help,John

supereal

04-21-2019 @ 11:30 AM

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Determine the rear end gearing as it will determine the shift point of the OD, and will affect operation of the car.

JT Ford

04-22-2019 @ 11:29 AM

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What difference does the rear end have to do with the operation???

carcrazy

04-22-2019 @ 1:19 PM

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The ratio of the rear axle will have a minimal effect upon the operation of the overdrive. The overdrive operation is controlled by a governor located on the transmission. Approximate vehicle speed for the overdrive to engage is 27 MPH once the accelerator pedal is released. When the car is slowing down in overdrive as the speed drops below 21 MPH the car will return to direct drive. These speeds were determined with the as build final drive ratio. If the rear axle is changed and the ratio is not too far from the ratio for which the overdrive unit was calibrated, the O/D engagement and cut out points will only differ by a couple of MPH.

40cpe

04-22-2019 @ 3:22 PM

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As far as i know, 3.78 and 4.11 were the ratios offered in '50. I put an overdrive in a 3.78 ratio car and it performed/operated flawlessly. As said above, it won't make any difference.

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