It may be the steering damper. When you had it on stands, did you check for play in the steering? When you inspect the suspension, you have to look carefully at all the boots and bushings, moving things about...looking for movement or split books or worn bushings. It may even be something inside the car, like the shifter bushings...they may have crumbled away and now the linkage is clanking about. Looking at the undercarriage, look for clean wear marks too.
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