Ford Mustang Forum - View Single Post - differential vent question
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post #7 of (permalink) Old 12-24-2015
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Joined: Dec 2010
Location: Salem
Posts: 702
Originally Posted by 5.0 Coyote View Post
There should NOT be any + or - pressure inside the rear diff,that is why it is called a vent and not a valve,it is there for equal pressure hot or cold.If it hisses either hot or cold it is plugged and needs to be removed and cleaned in solvent.
It's a one way valve with a spring and a rubber seal. Trust me. I took mine apart when I put on the turkey baster version.

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