FYI, Gear lube is supposed to smell bad. This is because of its high sulfur content. I'll agree that I don't want that smell in my garage either.

I was once removing the front axle from an independent front suspension truck (an involved process), and I had a tub of gear lube that I'd already drained out of the axle sitting on the ground. While I was laying on the ground under the truck I put my foot into the old lube. Those leather shoes went right into the trash.

For the $5 gear lube costs, changing it is a good idea. You can also check for metal chunks which might be a sign of future bearing failure.

-Tad