I have a new '06 2500 LBZ 4x4 cc sb. 900 miles on it. There is a noticeable difference in the engine noise between 63/64-67/68 mph. About 1700 rpm. I can only describe it as a drone. It is consistent and happens whenever I'm in that speed range. I haven't noticed it at any other speeds. Have any of you noticed anything like this? Is it normal? Thanks, Jim

I do plan on avoiding that speed range):h

gurn911 - There was a TSB on that for my truck and that added a dampner on the exhaust pipe just before the Cat. Check with your dealer. The bulletin should cover the '06 too. If you do a search on "1700-1800 rpm moan & drone", that'll give you more info.

Good luck.

I also have the "Droan" on my new, 700 miles, 06 3500 CC SRW LBZ. At the same time/ RPM of the draon I can feel vibration with my feet coming through the floor board that is allready starting to get bothersome.

Dealer put a damper on the exuast on mine and the droan is still there but nothing compared to what it used to be, search for "droan" there is lots of info

hummm where about do thay install this dampener?? cuz if i find it yall can have mine! lol

I have the damper on my thuck 2005 GMC SRW......Not much better..... If you can make one 2 or3 times hevaier... it may work good

What is the dampner and what do they look like that? ANy pics? I too have the dreaded 68mph drone still present even with 4" turbo back exh!

gurn911 - There was a TSB on that for my truck and that added a dampner on the exhaust pipe just before the Cat. Check with your dealer. The bulletin should cover the '06 too. If you do a search on "1700-1800 rpm moan & drone", that'll give you more info.

Good luck.

It was for earlier model trucks, not the 2006's. Actually they replaced the stock exhaust on those trucks with the '06 exhaust. Helped but did not fix it 100%.

Another worn out muffler bearing...<sigh>...When will GM's quality improve? Ever?