Annoying Vibration

jimbrown1 · December 19, 2010

I have an 05 Sierra Crew Cab Z71 with about 46K miles (Don't drive it much since I ride the bus to work). It has an annoying vibration between 45-48 MPH. I installed some 285/70/17 tires on the OEM wheels but decided to replace the OEM wheels with some MB Wheels Gunner 6 in 17X8. Today, I visited Discount Tire because I wanted them to do a road force balance with the GSP9700, which they did and said all checked out fine except one tire was marginal and it would only change the readout from 15 to 14lbs and it didn't seem worth it. After reinstalling the wheels, I drove around to see if it was now vibration free and it was not. They decided to install some P metric tires to replace these LT 285/70/17 Michelin LTX AT2. I decided to go back to the stock size of P 265/70/17 in the Michelin LTX MS2 tire since it supposed to be one of the best (if not the best) tires out there today. Needless to say, the vibration didn't go away and I just don't know what to next. Since I already sold the stock wheels that came with my truck I thought about looking for some of teh newer style 17X7.5 OEM GMC truck wheels to see if that would correct it. Not sure what to do next. Any help is certaily appreciated. Not wanting to get rid of the truck with only 46K miles.

SouthCo · December 19, 2010

Did the vibration start after installing the new wheels? Wasn't sure if the vibration started after the new tires on the OEM wheels or after the new tires went on the new rims. That might help pinpoint the issue. Tire size would not cause vibration. I dont know what "one tire was marginal and it would only change the readout from 15 to 14lbs and it didn't seem worth it" even means. The last change before the vibration started should be you cause.

papastoy · December 19, 2010

Did you remove those round clips on the rear drums?

jimbrown1 · December 19, 2010

Yes. My plan today is to swap out my 04 Tahoe wheels and tires to my Sierra and drive it to see if the vibration is still there at the same speed. If not, I know it's the aftermarket wheels.