Transmission leaking into transfercase

[josh0325]

Did transmission/transfer case swap on 1990 suburban. Transmission was a 2wd th40O from an R.V. I removed the tail housing,cans mounted a short input NP205 case to it.  Before installing I replaced the o-ring and seal in the axapter, and the gaskets.  My trans is leaking fluid into the transfer case, did I overlook something???

[Engineer]

The seal lip with the garter spring should be facing the transmission.

There are seals available that have a double sealing lip. Those are the preferred ones.

Other than that the only thing I could think of is maybe, possibly, you somehow cut the sealing lip when you were installing the transfer case.

[josh0325]

That's what I was thinking too is if I cut the lip of the seal. Man, that case is awkward for one guy.  Where can I find the double lipped seal at if that's the case?

[blazer74]

Hard to find the double lip seal, parts stores will have a note if they read it that says use two of this #.
Back to back, one facing to the TC and the other facing the adapter.
Found this out years ago, maybe you can get the double lip seal nowadays

[josh0325]

That makes sense, thanks for the advice.