Recently i bought a 09 cobalt SS its super fun but ever since i got it ive noticed this low pitch rotating hum noise but only when its in gear if i pop it in neutral the noise goes away. so we put it on the lift and determined it was the tranny or clutch. Its a hard noise to describe but i know it has to be drivetrain related since it does not make the noise just rolling in neutral. Any ideas what could cause this?
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