new slip yoke question

[markiemyster]

The old slip yoke that I was planning on replacing has grooves on the outside from wear. It is about 0.002" wear on a few grooves. Is this something I should be concerned about or is that OK. I just had my tranny rebuilt and I didn't want to put the old yoke back in if the grooves would cause a leak around the seal. I've talked to a few people and each one says something different. I had purchased a used one and that one ended up being worse than my original. Any information would be helpful.
Thanks, Mark

 

[00fxd]

Hi Mark,
Your local good parts store should have what is called a "speedi sleeve" for that application. It's a stainless steel sleeve that presses directly onto your seal surface. C/R seals or Pioneer products both [among others] make very good ones. You press it on with a hammer and a block of wood and use the same seal pn#. About $12. An easy and permanent fix.

 

[magicv8]

If we are discussing the Muncie output yoke here - assuming the rebuilt trans included a new output yoke bushing - are you talking about grooves where the bushing holds the yoke, or one groove where the output seal is? I can see how would a yoke with a small pressed on collar would fit into the new seal, but I am not sure that's what we are discussing here.

I have replaced the bushing and seal, and put back the worn yoke with mixed results. On one of the Muncies, it worked fine - and I know it will shorten the bushing life. On another Muncie, I finally ended up buying a new expen$ive yoke to stop the leaking.

To save money, I would use the old yoke with a new seal and bushing, keeping in mind that the life of the bushing is shortened by the wear on the yoke.

The downside is, if it goes to hell rapidly, you not only need a new yoke (you would have to buy one now anyways) but You have to pull the trans to replace the bushing, or it will tear up the new yoke.

If you did NOT get a new tailshaft bushing pressed into the housing during the rebuild, putting in a new yoke is a wa$te of money.

 

[markiemyster]

New bushing

The tranny was completely rebuilt with a Muncie kit so I assume the bushing on the tail was replaced by the tranny shop rebuilder.
The slip yoke shaft has the slight grooves (.002"). Do you feel that this is enough to ruin the new bushing. I don't know what the tolerance should be so that it does't leak between the shaft and seal.

Thanks, Mark

 

[magicv8]

The seal is cheap and easy to replace, and putting in the expen$sive to replace used yoke won't hurt it. Go ahead, but if the seal leaks, add the seal collar as suggested above.

My concern was that you had a badly worn output yoke that would chew up the new bushing in short order.

 

[00fxd]

I'm understanding the grooves are seal grooves where the seal rides the seal surface of the yoke. Fairly common. The speedi would permanently repair that. Also I would assume that it would also fix a worn bushing surface if it covers the problem area, The sliding surface on a trans yoke is fairly long so there is a chance there isn't one available but I know they are available for many applications, balancers etc.
Good luck, and let us know how it turns out.