I am looking for front differential and transfer case air vents. I did some off roading last year with deep water crossing and after a while my front and rear differentials started to leak. The problem was fixed by ford (still under warranty). I've located rear differential air vent, but I was unable to find them on the front or transfer case ( lack of access). Pic would be appreciated.

 

I found the vent for front differential. It's coming from the passenger side differential and continues up around the engine. The cap is clipped to the brake vacuum cylinder.

I wasn't able to locate the transfer case vent or transmission vent/breather.