1950 Hydramatic driveshaft yoke

Started by Aldixie, August 03, 2022, 10:58:19 AM

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Aldixie

Looking for a 1950 Transmission driveshaft yoke. My old one is seized to the transmission shaft.

Thanks
Alex Dixie

Bob Schuman

The slip joint must move when the car is driven and the rear of the car moves up and down with road irregularities. If yours is truly stuck it is likely that it would cause something to break when driven.

The 1950 Series 60S, 61, and 62 cars had the slip joint in the yoke at the back of the transmission. In Series 75 and 86 vehicles that joint did not slide, the slip joint was in the drive shaft a short distance behind the transmission, and the yoke at the front of the drive shaft was not intended to slide.

If your car is a Series 60S. 61, or 62, and has a transmission from a series 75 or 86, that may be your problem. On Hydra Matic transmissions the data plate on the right side of the transmission case has a serial number, beginning with C-50 for the Series 60S, 61, and 62. The Series 75 and 86 transmission will start with A-50. If you can look at the front yoke from behind, you may see a plug similar to an engine freeze plug in the center of the yoke. On Series 75 and 86 units, instead of a plug there will be a large screwed plug with slots for using a tool to unscrew the plug( you may need to make a tool to fit those slots, using a piece of 1/4 inch steel stock). After the plug is removed, the snap ring behind the plug can be removed and the yoke slid off of the transmission shaft. That yoke can be reused on a car without a slip joint in the drive shaft, by just reinstalling the screwed plug with a little thread sealer, and not using the snap ring. Then it will slide on the transmission shaft.

The above described work can be done in the car, but not very easily. With the transmission out of the car it is much easier to do.
Bob Schuman, CLC#254
1951 6137
2017 CT6-unsatisfactory (repurchased by GM)
1948 Olds 98 Custom
2020 XT6