Trans in driving me crazy!

[Hwy145]

I had the the tailshaft bushing and the seals replaced after a leak developed. Turns out the bushing was really worn. I parked the car the day before thanksgiving. No leaks for two weeks. I go on vacation, and I return to a puddle under the car (3 weeks after repair). Strangely, i see no sign of a leak by the seal of the tail shaft. I ran a towel over the tail of the trans- no fluid. The fluid is collecting below the yoke, and it has been dripping for a week straight. Is there a place on the slip yoke that can leak? 727 trans, btw…

 

[pnora]

There is a steel plug in the yoke like a concave freeze plug. Look closer and you should see it weeping in front of the u-joint to yoke area.

 

[493 Mike]

Early yokes had a vent hole in that plug and used a rubber seal that slid on the output shaft. That assembly required manual greasing of the splines. Sometimes the yoke gets used in the wrong application.
Mike

 

[Lefty71]

What year??

 

[Hwy145]

1965

 

[493 Mike]

1965

That was the first year of the slip yoke and had the vented yoke. If the output shaft seal is worn or not present a leak would be expected. The extension housing will have to be removed to inspect/replace the seal.
Mike

 

[Dave6T4]

1966 also had that seal on output shaft.

 

[Hwy145]

That was the first year of the slip yoke and had the vented yoke. If the output shaft seal is worn or not present a leak would be expected. The extension housing will have to be removed to inspect/replace the seal.
Mike

The output shaft seal was just replaced. Also, i drove the car two days ago- no leaks. It looks like it starts leaking after a period (two weeks or so) of sitting…

 

[Rishi]

A leak when sitting for a time could be oil pan gasket. Next time you're under there, clean everything up using some brake cleaner, to make it super clean. When/if the puddle returns, crawl under again and look for signs of wet oil seepage at the cooler line fitting, oil pan gasket, etc, etc. The leak is often over the very center of the puddle it leaves.

 

[Dave6T4]

If it doesn't leak, it's not a Torqueflite!

 

[Hwy145]

A leak when sitting for a time could be oil pan gasket. Next time you're under there, clean everything up using some brake cleaner, to make it super clean. When/if the puddle returns, crawl under again and look for signs of wet oil seepage at the cooler line fitting, oil pan gasket, etc, etc. The leak is often over the very center of the puddle it leaves.

The drips are directly below the yoke. I ran a cloth over the tail shaft and the seal. There was no fluid on the cloth. The only place I found fluid was on the yoke.

 

[493 Mike]

The output shaft seal was just replaced. Also, i drove the car two days ago- no leaks. It looks like it starts leaking after a period (two weeks or so) of sitting…

Did you check to see if the rear of the yoke has a vent hole in the center of the plug? By output shaft seal I was referring to the seal that slips over the splined area of the shaft, not the yoke seal. Reread my #3 response.
Mike

 

[Rishi]

Try starting and idling in neutral until the engine warms up, then shut her off and wait. Wait to see if it's driving that makes it leak, or simply running. Also, just because the shop says they replaced the seal at the yoke, at the very end of the tail housing, doesn't mean they did it without nicking it ior some other foul up. Based on what you've shared, it sure seems like that's where your leak is.