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Try an experienced alignment shop, perhaps one that works on exotic or race cars. I think there is something wrong with the suspension.

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My 2006 Impala does the same thing. In fact, it did it more after I had a 4-wheel alignment done on it by the dealer than it did before the alignment.

I have read of this happening on other '06+ Impalas. While it is a bit unnerving, I have become used to it. I do not think there is anything mechanically wrong, rather it is just how the rear suspension reacts to bumps.

My only suggestions would be to make sure your tires are inflated to the pressure indicated on the sticker inside the front door. If the tires are overinflated, they will bounce a little more over bumps. I have noticed that if I have the tires more than 2psi over the recommended 30psi, the car really rides and handles differently. I tried putting them at 32psi front, 30psi rear, and felt that was the best combination. However lately I have been running all four at 31psi. When the spring weather stabilizes, and we stop having 25-30 degree temperature swings every day, I am going to set the tires back to 32psi front and 30psi rear.

Aside from that, I go out of my way to avoid potholes and manholes (literally...I have been known to change my commute based on potholes, roadwork, etc.) My Impala has enough rattles as it is, which are becoming more of an issue than the rear-end stepping out :)

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I reviewed all the Technical Service Bulletins for a 2006 Impala and there's no mention to this problem per se, but there is mention of a factory effort to determine the cause of numerous complaints about rear end clunks and other noises, so perhaps these two issues are connected.

The TBSs don't offer solutions but suggests a general inspection and tightening of various rear suspension components and possible replacement of the rear struts.

So I think there is something going on back there.

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