Trans rear seal

[xx88man]

Yesterday I changed the rear seal on my 727. I get under the car today to change the transmission fluid and I noticed that the new seal is leaking too. Car hasn't run. Very little play in the output shaft. Is it possible that the slip yoke is my problem? Has anyone seen that before? Is there something I'm missing?

[7dcuda]

Slip yoke could very well be the possible problem.  Over time, the seal can wear a groove in the slip yoke where it rides.  If the yoke has that groove in it a new seal will not seal.  If you didn't inspect the yoke you'll need to pull the drive shaft back out and inspect the yoke surface to know for sure.

[RacerX]

I rebuilt my 727 and installed new tailshaft bushing, new seal (proper style with "dust boot") and,
hoping to avoid this very situation, also used a NEW yoke.

The result?    It still seeps a little bit of fluid and drips occasionally at the yoke.     

[xx88man]

I rebuilt my 727 and installed new tailshaft bushing, new seal (proper style with "dust boot") and,
hoping to avoid this very situation, also used a NEW yoke.

The result?    It still seeps a little bit of fluid and drips occasionally at the yoke.   

Wow that's frustrating!
Just pulled mine again and yes the yoke is worn     Is it worth looking around for a used one?

[xx88man]

I ordered a new yoke. Thanks for the replies

[Brads70]

I ordered a new yoke. Thanks for the replies

Good move, they are not all that expensive for a new one. 

[xx88man]

I ordered a new yoke. Thanks for the replies

Good move, they are not all that expensive for a new one. 

So true Brad! I was pleasantly surprised... don't see that too often nowadays

[Chryco Psycho]

Changing the rear bushing may be nessisary also , there is a tool available to do it basically in car .