@greentruck - I've already bought everything and if it's leaking at all I should get it fixed, besides. I'd rather repair the issue than just adding diff oil and grease to the knuckle.
I won't argue with that get it done approach, except to note that the grease goes in the knuckle, but the diff oil goes in the diff

Keeping 'em separate is part of why you do the axle service. If they mix on their own, that's an issue, but you don't want tp help them mix if at all possible. If they are mixing, that's a reason to expedite servicing. If you're getting some noise in turns from a birf and it's just low on grease, then fill and keep running until the next scheduled service would be what I'd do. That's where the habit of topping them off during intermediate servicing is a good practice.
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