I've got a 2004 3500 that has had a banging/clunking sound over heavy bumps (ie.railroad tracks,cattleguards, large pothole/bumps) since new. It sounds like someone is hitting the box with a sledge hammer. My dealer and myself have checked it over and everything seems tight. The only thing I can think of are the overloads but I would be suprised If these would make this much noise when they contact. Has anyone heard of this problem or is this normal for a 1 ton truck??

 

Your not the only one, I think it may very well be the overloads.

 

do you have a receiver in your hitch

when my receiver is in my hitch when i go over speed bumps it makes a bumping sound like something is hitting the frame

 

Thats how almost all of them are. It kinda scared me the first time I thought the trailer fell off.