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A bad shake has developed in my relatives 2008 Chevy HHR SS. I can replicate it by getting up to highway speeds and letting off throttle. Certainly feels like its coming from the front passenger. We have replaced a CV axle to try and fix the issue. After installation it seemed to help a bit but the noise and vibration were still there. Some time has passed since the new cv axle was installed and its gotten worse. The only way to have a somewhat smooth ride on the highway is to constantly have some load on the drivetrain.

Any help is greatly appreciated!

RJ_RS_SS_350

to the forums!

The link in my signature may be of some help.