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ride problem

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It sounds like your suspension is not tightening up as your speed increases. Try running your OBD codes and see if any RSS DTCs come up.

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Generally a vibration at higher speeds that gets worse as speed increases is either suspension out if alignment or wheels / tires out of balance. In my opinion, that era STS chassis is somewhat sensitive to wheel/tire imbalance.

Have the alignment set.

Ask your dealer or tire shop to balance the tires.

If no improvement, look for a road-force balance service.


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I would skip straight to the road force balance. I had my sts balanced once and later road force, made a LOT of difference. I think it was $37 at my GM dealer. It would drive smooth most of the time under 65, or over 80, but never at 70.

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