I had the same symptoms in my old 95 firebird where a constant thumping would come from the rear under acceleration. Sounded like it was coming from right underneath the rear seats when you were inside the car. Turned out that I overloaded the suspension with too many people in the back seats. Do any heavy hauling lately?
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1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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