Quote:
Originally Posted by Grady
Not 100% sure but do not think it is a breather. I believe it is a over/under pressure valve. Not vented to atmosphere but there to relieve pressure if needed.
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It's for sure a breather. Without it we would be losing seals. You can move it open/closed with very little effort. There is one just like it on the diff too. Gravity basically holds in closed and any positive pressure due to heat won't need much force to open it.