700r4 to adapter seal question

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Jun 15, 2012
Santa Cruz, CA
Afternoon All,
Just a newbie question - am done with my first trans rebuild, ready to reattach to the t-case adapter. Any reason I can't use an o-ring instead of reapplying permatex? The permatex made separating the two a real pain in the arse. Also, does the void created between the trans and adapter fill with trans fluid? I thought not, but see fluid. The t-case has its own oil, so perhaps the adapter needs it.

A picture of the tailend of the 700r4 is here: https://www.flickr.com/photos/gneier/16265425821/

thank you,

oring found here: http://www.ebay.com/itm/151332279466
Not the same trans, but my 4l60e has a rubber O ring there.
It mates surface to surface.

The factory used an o-ring so I don't see any reason that you shouldn't. If it was had to get off though I would take that as a sign of sealer being the way to go. I have seen this setup get loose on the trail and it no fun once it get loose having to lay under it and work if you don't have too.
Thanks Guys, will try the oring and perhaps a very small amount of permatex.
So.. that void fills up with tranny fluid? Any idea if its under pressure? I would imagine it might be. If the seal fails, then you'd lose fluid pretty quick
Mine uses a seal. The trans housing is vented so I would not imagine the tail section is under pressure, but I may be wrong.
Yea, I don't know either. I suspect it at least gets fluid. My 700r4 doesn't have the tailhousing - connecting right to an Adv Adapters unit, then to a Landcrusier 60 series split t-case. Without the tailhousing, the governor plastic gear is visible inside. Plus there is tranny fluid on the adapter side. Will see how it goes.. will post a picture once I get the o-right and try it out
On mine, I KNOW it gets flid!!
My mount (when I built it) did NOT allow for enough flex...
Long story short, the adapter started to separatefrom the t cases and it leaked quite a bit.
The stock seal is a square O-ring.


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