Rear end jacked up so both wheels are off ground, put in Neutral, turn car off.

Place your fingers against the wheel hub carrier near the center where the bearings are and rotate the wheel (either direction). If it feels anything other than smooth, like if it feels "gritty"... it's a wheel bearing.

Compare to the other side to convince yourself.

If you have a mechanic's stethoscope, probe around near the bearing on the back of the hub and you might be able to hear the bad bearings grinding / scraping.

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Cheers!
Scott McPhee

1987 300D