Are all the plastic washers in your leaf springs?

 

I believe so, last I checked any way... I think I'm going to have my father or someone ride in the bed down the street and back and see if he can pin point the noise a little better. It makes me want to drive with my windows up which I never do in the summer.

 

Heres one ride with the brakes on a bit just enough to put a small drag on it, sometime the brake pads will move on the calipers and rattle just a thought

 

Yeah, I've checked the brakes. Plus it's coming from the back and my rear brakes are drums... Thanks for the thought though. Never know what could be causing it.