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Just posted this on another site and want to spread some info and get GM to do something: This is what I have done: 1. Placed dynamat on entire rear of cab behind insulator...................still have the noise 2. Placed Dynamat over vents.................................Don't do...

Fixed road noise I removed the passenger seat today and placed some "ghetto dynamat" over the vent. I cut a 18" piece by 6" wide piece and started about 2 inches above the vent and went down to about 2 inches from the bottom of the rear of the cab. Make sure you leave about a golf ball size...

Moved my bed to 1" space from bed to cab on both sides. Left side was 1" and passenger side was 1 and 1/4" . Move bed to 1". No change in noise. Will put some dynamat over the passenger vent tomorrow. I'll post. Hey Stumpuller 6.2, I have the same truck and color, but have a 5.3...

I have realized that the drivers side gap between the bed and cab is 1", but the passenger side has 1 and 1/4" gap. My friends 09 Crew cab has 1" gap on both sides. And his rear pad is different. His rear pad has a hard rubber side that faces the interior (seat area) and the side facing...

Crew Cab noise Hey guys, found this forum after doing a search for "noise from rear crew cab" and I have it also on my 2011 crew cab 4x4 slt sierra. Brought it into the dealer and showed them the TSB. The did the repair , just as stated in the TSB and replace the rear right vent. Guess...