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I have this ridiculous squeak from the back left of my C5. I replaced the ride height bushings on the leaf spring thinking that was it but it still squeaks when you push on the back fender. I laid under while my wife pushed down. I can’t tell where it’s coming from. Any common areas? Sway bar has new bushings. Thanks guys!
You could grease the stabilizer bar bushings, easy to do. Stabilizer bar end links?
Check the fender mounting bolts.
The exhaust hangars and mounting points.
And the suspension components. upper and lower A arms, shocks.
You could use an automotive stethoscope to diagnose while you wife pushes. ttps://www.harborfreight.com/mechanics-stethoscope-63691.html?cid=paid_google|||63691&utm_s ource=google&utm_medium=cpc&utm_campaign =&utm_content=&gclid=EAIaIQobChMI3LTKx9D Q6AIVBdVkCh2hAgqPEAQYAiABEgKqn_D_BwE