The additives in GL5 type gear lube *can* be corrosive to yellow metals.
Double emphasize that word *can*. It doesn't have to corrode them,
some of them don't. The corrosion can take a heck of a long time, years
in fact. It's the sulfur that is often used in GL5 lubes that does the
corroding. Not all GL5 lubricants use sulfur, not all GL5 lubricants
use the same amount of sulfur, and not al GL5 lubricants use the
same type of sulfur.
So drain your rear end, put in a different lubricant, and try it out.
There's a very good chance that you'll be just fine.
And Doug, if you saw shiny bits of metal floating in the oil, that's
not corrosion, that's mechanical damage. Corrosion doesn't give
you shiny brass flakes. Flakes come from wear.
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