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I've seen all types of issues from an axle having its standard vent port plus one in the upper access panel and the pressure still blows inner wheel seals or even pinion seals to those like my 923 that went 150,000mi and never leaked an inner seal with a wet hub. Then a new seal leak 3 weeks...

If you are deleting your ctis seals you will have to install the outer seal found on the A1 trucks. The ctis seal is good enough to seal the outer bearing in oil and the air chamber and inner seal from letting it pass thru. I've seen A2 trucks with the outer a1 seal cause they had gear oil...

There is an outer seal that seals directly against the bearings this seals the bearings from the oil. You can leave the air seals out and pack em with grease. You can let oil fill the hubs however I have run into issues that unless it's an SKF seal the pressure on the housing just blows...