2004 GMC sierra 1500 sle, slaping/thumping noise coming from bed under...

Ron

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...carriage can anyone help.?
Me and friend have inspected under carriage and we can't find anything loose anywhere.
 
Did you try and shake the exhaust pipe? It might look like it's ok, but still be loose enough to clunk around when going down the road. Also, check the shock mounts.
 


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