2006 Sierra Denali vibration starting @ 70 MPH
 

I have a 2006 Sierra Denali AWD. From the day I drove the truck off the lot I noticed a vibration starting 70 MPH the faster I go the worse it gets. The dealer has told me that all the Sierra Denali trucks have this. Any one else have this vibration. If GMC new that the truck has a vibration @ 70 they should have disclosed this to me the buyer, stating THIS TRUCK WILL STARTE VIBRATING @ 70 MPH AND GET WORSE THE FASTER YOU GO.

RE: 2006 Sierra Denali vibration starting @ 70 MPH
 

if you have general tires on it have them check to see if they are out of round.

RE: 2006 Sierra Denali vibration starting @ 70 MPH
 

Strange they would say they ALL have that problem, to me it sounds like tire balancing and/or warped rotors.