loud banging from drivers side back end

[tmschiefer]

Hello,

I have a 1968 Chevy C10. It drives straight and narrow but whenever I hit the smallest of bumps or potholes the truck makes a terrible metal on metal "bang." I have looked around under the truck and tried to listen to the exact location of the sound but I cannot figure it out.

Any advice would be much appreciated. Thanks in advance for your help.

T.