ok thanks for the info guys it looks like a diff rebuild is in order. I have an idea tho.

When I seperate the cases, I was thinking about cutting a thin groove around the outer edges and using a permatex or rtv sealer, pretty much to make a non-permanent gasket for the case, then making refiller hole on top and sealing it with a grub screw or somethin. I'd prefer an oil over grease, so hopefully that would help with the leaks.

And if that sounds like a good idea, how much should you fill the diff up? All the way? half way?