See if a friend can get in back seat and have him move around even if he has to take a ride in the trunk. Hopefully he can pinpoint the side or if center to determine if you bent an axle or wheel or maybe the drive shaft. Also look closely at your driveshaft to see if it knocked off any of the balancing weights including balancing weights off your wheels. usually there’s a fingerprint where there used to be welded on. if it’s missing I would weld a washer to the driveshaft in that spot and see if it starts to help if it does add more washers till it’s gone then take the driveshaft out and have somebody correct it properly. You mentioned that you had all the wheels checked too. Does that mean the wheels were off the car and brought to a tire shop for balancing? Also running it up on a Lift will sometimes help find vibrations or create a sounds and noises that are normally OK but during unrestricted torque loads you will get weird sounds that are normal that wouldn’t happen with the wheels on the ground as you drive normally. Hope it helps. I’m always trying to find vibration issues at work.
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