!st 4x4 trk ever owned, i can usually deal with routine maintainence and repair but this noise is driving me insane .. when i go over bumps i get this sound like a bag of loose washers ive checked cailper slide pins rotors pads checked heat shields for looseness changed sway bar bushings and links to moog..I even took my nerf bars off cause i thought they could be the culprit.. i changed out the front rt cv axle cause the boot was ripped and had play in it so im abt at the end of my rope! (just kiddin)... ok the truck is a 2003 f150 4x4 with 199k miles and the motor runs great.. any help would be greatly appreciated..Been on this almost daily goin on 2 weeks Thanks everyone...

 

See if your spare tire underneath in the back is tight, mine was loose one time and drove me nuts

 

Slide under your truck and whack on your cat converter and or muffler and see if the stuffing inside either or both has come apart and is rattling.

 

Welcome..
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Busted shock(s)?

 

Is that on your 2003? Grabbed that detail from your intro thread.

 

Check out https://www.youtube.com/@JustRolledIn/videos They have automotive mechanics that send in videos of all kinds of weird sounds that customers have complained about. You never know, maybe even the same sound you are hearing. If nothing else, you'll be entertained.