There is no diff cover gasket, just sealant,

Get an axle output seal. Those are cheap even from the dealer and you may as well do it when the axle it out.

Worth looking at your rear diff mount too, since you have to take it off or get one step away from taking it off, now would be a good time to do it if you need it.

I did the pair in around 2-3 hours, not sure if that's fast or slow.

edit:uberwasser beat me to it.

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