Originally Posted by TooFast
That axle shaft is subject to an unpressurized "catch-as-catch-can" splash oiling system in contrast.
Not a big confidence builder given what'll happen if that bearing fails.
I've read that if you change diff oil after the first hundred miles that you'll double its life. This was some time ago; the rationale was that the first hundred miles would scrub off any remaining grit from machining and suspend it in the oil.