Get under there and tap the sway bar from below with a rubber mallet.
If you hear a clunky noise rather than a dull BONG BONG BONG you've got play in a part somewhere. Use the mallet to identify which part. May be a loose bar bracket, worn bushing, you may have a faulty rod end on the endlink itself, etc.
Always hard to identify these issues via the internet, if I were there I could help you figure it out very quickly...
Do be sure that the jam nuts are snug on the endlinks..
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