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The CTIS uses SPECIAL hub seals that ARE designed to hold the pressure, while non CTIS seals are designer to hold oil in/dirt out but are NOT pressure seals. This is why CTIS seals are so much more EXPENSEVE the non CTIS seals. I am not sure how the CTIS is internally plumbed, The leaking seals...

Very true on the thread movement, the reason is a good vent does not stay good very long, I have pulled vents from trucks that has not been run in a week, every time there is a pressure release, and every time the reason the vent got pulled was because on a seal seep, either at the hub OR the...

ALL the axles have axle vents, on the front, air will be drawn in through the axle seal, oil out, the grease will be no where near it, also while we are on "axle" vents, the transfer case has the SAME vent as well as the manual transmission, these ALSO have the SAME issues as the axle vents...

WRONG about the MOD being POINTLESS, the axle vent ONLY breathes one way "out", as pressure builds and the vent is SUPPOSED to dump the extra pressure, it dumps the pressure, then the axle cools down, the pressure drops, to where there COULD be a bit of vacuum, this will tend to draw dust, ect...

Put a cheap in line gas filter at the end of the vent hose with the open end of the filter turned down, this will keep dust and water from being drawn in when the axle breaths.