Like the title says
92 f150 5 speed manual, leaking at the back of the transmission intself there is that "adapter/Cover" that connects it to the transfer case and also seals the trans.
I have used blue permatex still leaked
Tried making a gasket still leaked
now i used red silicon the anaerobic kind and it still leaks

Dealer does not sell a factory gasket.
Any help or ideas!?!

 

Are you sure its not the shift rail plugs?

 

It mite be that would explain it.......Ill have to look closer because i know its leaking down the side BUT i thought i had fixed that but it may be ever farther up! Thanks ill deff take a look!!!

 

The shift rail plugs and shifter pivot cover are both known to leak. If either is leaking, they are not too hard to fix. There's a link on this site (I think) regarding the shift rail plugs leaking on the M5OD transmissions used in Rangers, Mazdas, and F150's.
I replaced my rubber plugs with 5/8" freeze plugs, which is recommended.
Make sure you're topping off your transmission with Dexron/Mercon 3 or 5, you obviously don't want to run that puppy dry! Post back if you need some help.

 

I took the floor out and the cover to the transmission -
There was a nice clean spot right from the top shift cover all the way down the side of the transmission - so i'm replacing the gasket AND the shift rail plugs...Also rebuilding the shift lever. Thanks guys looks like it was leaking where i did not expect it to be.