gocyclic

I have recently started hearing a metallic "chirping" noise coming from the rear of the truck (2013 fx-4 30k miles) usually while driving over city streets in need of repair. I can't mimic the sound by shaking the car when it's parked but when I moved it side to side I could hear a dull "thunk" almost as if the rim or a tire was not on all the way. Truck drives fine though otherwise. And of course the dealership can't hear the noise.