Suspension problem with my 2007 Chevrolet Impala.
There is a clunk type noise. Can describe as a rattle as well. It is in the rear of my  
Impala. I can hear it when drive over bumps or just when turning the car.
The sound is on both side. The shop checked the rear shocks / struts and said that
they not the problem. What can cause my noises.
A common cause for rattle and clunk in the rear of a 2006 or 2007 Chevrolet Impala is worn rear stabilizer link rods. This picture is with the wheel off. Technician pointing to rod. Brake rotor below his hand.
JK:
This sounds like a very common problem with the 2006, 2007 Chevy Impala.
There is a rear stabilizer shaft in the rear suspension. It has 2 link rods, 1 on each side.
The ball / socket on each end of each link can get worn and loose. This will cause the
noise that you are hearing.
It the car has less than 36 k miles, this will be an item that will be replaced under factory
warranty.
Expect about 1 hour to complete this repair.
See picture below. It is with the rear wheel removed. The Tech is pointing to the link rod.