I think I fixed it ... I sprayed some Tri-Flo liberally around and into (I think) the rubber donut area. Now there's absolutely no noise. I'll keep the bottle in the car in case it comes back. At some point in the future when I'm under the car I might take off the driveshaft, remove the rubber donut, and properly lube it with some moly grease. But for now I think it's good.
I think I'll swap out the diff fluid anyways. Trying to just work through the entire car and hit all the "last time changed unknown" fluids. I'm sure it's old and needs replacing anyhow ... and it's the last fluid-holding part of the car that I haven't flushed and replaced.
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