Jacked her up, shook the wheel (no movement), turned the wheel, took off the tire, inspected the area and the brakes (still half a pad left) and found nothing. I know that if it's a bearing I wouldn't be able to see it, but got no sounds, no bad movements and when I went to the pet store there was no sound.
Wonder what it is/was. . .

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Ginny in Denver-ish
78 300SD, 265K (mine)