I had the same problem, it was driving me nuts, Dealer could not find the rattle, But i Knew it was there ! so i pulled off the door panel and found out the int door handle rod was touching the body metal of the door and i put some foam in there and no more rattle. also as you have read the door speakers are a problem with NBS chevy's
Is your truck an extended cab? if so that could be your doors making the noise. neither my driver nor passenger doors fit right. lots of play in them. they just shake.
I had a problem with my door rattling so I pulled the door panel then closed the door and had my kids jump up and down in the back. I found out it was my window. I made sure all the window frames were tight and found a bolt was loose.. Solved the problem.. :head:
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