I lost most of the fluid though the sensor that bolts on the side off the diff. when I was wrestling with one of the axle nuts. I took the subfram completely out of the car. I removed the higher of the two drain plugs and added one quart of 85-90 weight gear lube. It was just starting to spill out when the bottle was empty. I forgot to list that I replaced both half shafts because the boots on the originals looked like they may split at anytime. They do not clunk and I do not think they are the culprit.

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1987 300D 146K Original #14 Head
One eye on the road, the other on the temp. gauge

Gone But Not Forgotten
1983 380 SEL Long gone
1983 300SD Wish I hadn't traded it in on a 90' Corvette
1989 300SE My all time favorite
1995 E420 Went like a bullet