@Dipstick @Slate
The best thing you can do for those garbage axle vents is throw them in the trash and do not replace with new!
Grab (3) 3/8 push lock fittings with (if I remember correctly) 1/4 npt thread on the other side, and run 3/8 nylon vented up high.
I like to take both rears and T them together high under the bed, and run that line forward and grab the front axle line, T in, and open vent beside the air cleaner box.
Many guys have ran 1/4 line but it’s too small, it works BETTER than the milspec vents but to be safe I recommend running the 3/8 for zero pressure on your seals.
I’ve also vented my transmission and transfer case the same way, you’d be amazed out how many leaks this prevents
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