Ok, so my 93 940 turbo has the need for new rear bearings. I have searched and searched on here and other sites, but no really good pics or procedures to go by. I removed the D/S axle tonight and I see why my bearing was bad, it has run dry and did not have too much wheel bearing grease.

Two questions:

Do the rear bearings ONLY get lubricated by the heavy bearing grease that they are packed in? or is the whole axle tube (from wheel hub to center diff) supposed to have some level of diff oil in it?

Second:

I see corrosion inside the axle tube where it is dry and obviously some moisture has infiltrated and caused some flaky corrosion to form. It goes most of the way down to the diff, but pretty much about 2/3 of the distance from the back of the wheel hub down to the diff where "sloshed" gear oil has lubed the inside of the tube.

I have only been driving this car for about ten thousand miles (it has over 330K). Does the center diff gear oil level travel down the tubes to lube the axle shaft? should I add more gear oil?

I have been trying for weeks to get the big brass plug out of the rear diff to check the fluid level, but it is all gnarled up and the bolt head is completely unusable. I tried to weld a nut to it and figured out that it was brass/bronze, and the welded nut just came right off..DANG.

I have decided to remove the speed sensor and check the diff oil and refill using that aperture.

Any thoughts or advice?

thanks
Kevin