Differential sweat

[dazza]

Can anybody give me some insight on the concave indents, four on each side, of the front diff.? I would assume they're pressed in to hold the axle housing.
The reason I ask is that they all seemed to be filled in with some type of epoxy/weld from the factory, however one is completely smooth like the filler has fallen out. The diff has been empty for over a year now with the cover on, but this one empty indent seems to sweat oil, very slow. I can wipe it and a few days or a week later I'll check it and it will have the oily film.
Should it be filled? With what?

Thanks


The sweaty one:



Wiped clean:



The opposite side of the diff:



Here you can see the one above it, partially filled, no sweat:

[kwmech]

The axle tubes are pressed into the housing, and what you see is where the tubes are plug welded. Occasionally they will seep 90 wt after years of use and flex. You could maybe try gouging out the weld a little bit and cleaning it with brake clean. Then try a good silicone or even JB weld over it