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It's highly unlikely that geared hub oil is getting out to the rotors so if your seeing it there it's probably differential oil. That's another story altogether. I've never pulled the diffs out but suspect you will need to drop them to service the output shaft seals.

Now's a good time to drain the hub and inspect inside. The hex drain plug can be a PITA to remove but everything else is easy. Both the side plates and the axle seals can be done in the vehicle. The job is pretty straightforward and can be done without removing it. Pull the wheel and remove...