I have an '05 350 ZR with 19.2K miles.
I just recently noticed that when I put the car in reverse and drive backwards a little I can hear a distinct metallic "clink" coming from the wheels. I think it is happening in all 4 wheels but am not sure. It "clinks" once & then stops. Doesn't seem to matter if the car is warm or cold.
I can sometimes hear it going forward, too but not as often.
Anybody experience this too? Is it serious?