Squeaky shocks?
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Any oil leaking out from the shocks/struts?
https://ls1tech.com/forums/general-m...e-repairs-102/
It could be a the brake line bracket attached to the rear axle, its known to squeek. Also could be various bushings as mentioned already.
Regardless you should replace your factory shocks anyway with some that have better valving, you will get better ride quality, better handling and better feel. The factory shocks are the weakest link on these cars by FAR.
This would be a bare minimum:
http://www.stranoparts.com/partdetai...D=20&ModelID=7









