I've noticed a rattle behind the dash, only on bumpy roads sounds kinda of like a metal clamp hitting something...anyone have this issue?

 

My '96 t-bird had a screw laying in the dash somewhere, rattled like crazy from brand-new. I found it myself by banging on the dash and fishing around underneath with my hand.

 

I had one when mine was new - I am not sure if it quit or I just learned to ignore it.. My biggest gripe now is the parking brake will "slam" left & right on bumpy roads & makes a lot of noise. I haven't looked to see if there is something I can tighten in the brake/brake frame so this won't happen...