Got a vibration between 35-45 MPH what can it be?

[Kibokojoe]

Son was driving his 7 and heard a bong sound from the back end and now he has a vibration between 35 and 45 mph? Any guesses?

[Tiger]

Wheel weight flew off.

[632 Regal]

Wheel weight flew off.
yep, shakes while braking around 55 are front end parts, shaking around 75 are out of round tires.

dont forget mud buildup on the back side of the wheels too.

[Kibokojoe]

To close this out the vibration came from the loss of a balancing shim on the driveshaft. Shim has been replaced and all is well