Often rear end noise will radiate from the drive shaft.
Anyway that you could SAFELY put the car up in the air and run it in gear? Maybe lightly apply the e-brake to "load" the drive train...
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2017 Camaro RS -217 cu in 365 HP w/8 speed auto
1967 Camaro SS -5.3L LS w/4L60E & 4.11 12 bolt
2019 Cadillac XT5 3.6L V6 w/310 HP & 8 speed AWD
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