So my rear end was making a very loud clicking noise, kind of sounded like something was binding up. It would only start to do it after I drove the car for a while, like something needed to heat up before the noise would start. I couldn't figure out what it was, I checked the wheel bearings and the cv joints and they all seemed good. So I pulled the fill plug out of the differential to check the fluid. Nothing started running out when I pulled the plug so I put some more oil in it. I'm not sure how much I put in but it couldn't have been any more than 4 oz., if that. Now the sound totally went away! Are the diffs VERY sensitive to the fluid level? It seems to me they should be able to operate just fine if they are a few ounces low on fluid, but maybe I'm wrong?

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1981 240d (The Diplomat Car), 1988 Dodge W250 (The Bruiser), Volvo 262 (The Never Ending Project), 1972 Duece and a Half (Will Winch Over Anything)