Weird sound when braking/accel.

Odd sound. Well... I have some idea of what it is but unsure how to resolve.

When I brake or accelerate, there is a sound like BB's or gravel moving. Like moving to the rear when accelerating and to the front when braking. It on the passenger side, underneath.. Is there an area underneath where gravel or something could be trapped, like in a channel or support beam, and its loose in there and making noise?

If there is, I have no idea how to get it out. Any ideas? Annoying as hell.

 

Have you emptied out all your interior compartments - all door pockets, behind & under seat storage, checked under seats etc?
Is everything out of your bed, including bed storage boxes?

Hopefully it's not underneath.

If all else fails, crank the stereo to save your sanity.

 

LOL

Yup, done as much troubleshooting as I can which even involved pulling the carpets up to see what was under there. It really sounds like little pebbles running along a long metal channel or support

 

I had a similar sound. I found that an exhaust bracket had rusted and just hanging. Took it off, no more noise. It was near the converter