So I noticed about 3 weeks after I installed the Ksport coils on my HHR that I developed a squeak from the rear of the car. I sprayed WD40 on every moving part I could find and it seemed to help for about a week then it comes back. I'm finding myself spraying WD on a weekly basis...it seems that he noise is primarily coming from the rear trailing arms. Anyone here have this issue? Could it be the shocks making the noise and I'm just thinking the WD is doing the job? I've got my rears set as low as I can go.

 

probably axel bushings