Well, my right (passenger side) seal is leaking apparently. Nothing major, in fact I just noticed it this past weekend. The knuckle looked a little oily, but no spun out oil pattern. I decide it is time to check the diff fluid level, and lo and behold, it was pretty low. I had to stick my finger in past my middle knuckle to reach the fluid level. No telling how long it has been this low, but it would seem by the evidence suspended in my diff lubricant, it was long enough for my big metal parts to proceed to make themselves into smaller metal parts. The fluid looks like a metal flake paint, and the magnetic fill plug had about a 1/4 inch of metal goo stuck to it. For what it is worth, there were no big chunks, and the diff doesn't make whining or grinding noises when engaged. I really haven't found a real good schematic, or least one that doesn't require a microscope. I've never messed around in a D30 before, so I don't really know their idiosyncrisies. Thanks all for the info, and if anyone can give me some advice or forewarning, it would be appreciated. Thanks again, Dann