At low speeds, mostly noticable when I'm braking but also a bit while accelerating, in the under 10mpg (maybe under 5mph) speed range, I can hear a distinct noise coming from the back of the car. I can also hear it in reverse. I don't know yet whether it's the right or left side.

It's sort of like two pieces of metal passing against each other, and sort of like the sound you get from a bottle that's catching the wind. I don't know anything about the mechanical aspects of suspension and axles and such, so any advice about what this could possibly be is appreciated. The sound just started a few days ago and may be getting slightly worse over time.

Thanks again bricksters