Might be the drive shaft. As I mentioned before 38 to 42 mph comes and goes. I replaced the ujoint no more noise
Sent from my XT1254 using Tapatalk
Sent from my XT1254 using Tapatalk
Well then, remove the dash panel, while you have it removed lightly stuff some acoustical foam in the voids or stick some ensolite on the back side of the dash panel or both while looking for the rattle.
Here is a link for the dash removal.
http://www.sparkys-answers.com/2011/03/2004-chevrolet-silverado-dash-cover.html
When I did my downpipe I used a body saw to cut my heat shield in half and reinstalled it, I'm sure it's their for a reason. Like when the turbo starts glowing after a long tow or driving, couldn't imagine why GM installed them in the first place....:whisle:
=
=
=
=
Still fighting this, and noticed the other day it seems to be ALOT worse when its bitter cold outside. The temps got up in the 70's the other day and the noise didn't seem to be too bad. I think my next step is to remove the entire top dash panel and look around to see if I can find something that I wasn't finding with just the radio and instrument cluster out. So aggravating!!!!