By the way, you will need a new rear SET10 bearing and bearing retainer to install the new seal. They need to be removed to install the seal and removing them destroys them.
You're sure it's not brake fluid? Gear lube doesn't usually make it onto the brake shoes.Follow up to this. The diff oil that leaked from the axle is on the shoe. I know this means that I need to replace the shoe. However, I'm wondering if I should go ahead and replace both the passenger and the driver side rather than just the passenger?