PLEASE HELP Really Loud Squeak????

[m_h_20]

I have an 07 ram 1500 quad cab 2wd and it has this horribly embarrassing loud squeak and i can not find out where its coming from. I know from the back end of the truck but thats it, every time i hit a bump in the road it squeaks and i can jump on my back bumper and it squeaks. Its this really loud sqeak sounds like it might be metal on metal and the noise will kind of bounce with the truck. i have gone through every bolt and nut i can find on the back of it and still nothing. Any help is very very appreciated. Thanks

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[texas red]

its possible its the leaf springs dodge replaced mine before the ole 36-36 factry warr was up they were creeky squeeky terrible just getting in an out of the truck let alone goin down the road. bounce on bumper lots of noise in AZ i would go "play" in the river/washes they got wet alot i attributed it to this it was the inserts at the ends (rubber) that it was comming from my new ones started a bit of same but same not nearly as bad i soaked with spray lub from that point. just a thought!!