Tranny pressure?

Jo060

Member
:
2015
I have a leak coming out of my left axle, when I went under the tranny to crack open the filler nut to check the fluid level I heard a hissing noise coming past the threads. I don't know if it was air rushing in or out, I checked the fluid again a few days later and the same thing happened. Is this normal, is the air coming in or out?
If it's not normal, is there a breather valve that I'm unaware of that could be plugged?
 
What is the best way to get to this cap? Also is it something that typically clogs? Any particular way to clean it out?
 
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