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If your getting air out when you remove the vent, it is not working right. I would replace them out a a central vent system ti all the axles. Here is a thread about them.
http://www.steelsoldiers.com/showthread.php?125848-Leaky-wheel-seals-caused-by-axle-vents&highlight=vents
Here in AZ I am always looking for them. I know they are there someplace, Do not put yours hands and feet were you can not see.
Do not go out at night without a light.
I do know there is one mounting bolt inside the PTO you have to take lose to get it off. I have not removed one from the trans on the truck, looks like it will be a bear!!!!