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Ideas on highway only vibration...

z71duke

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z71duke Enthusiast

z71duke

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I have a 2010 Sierra CC 4x4 with 72k miles and I'm at a loss over a vibration that I'm getting from 68-72 MPH only. The truck has new Toyo AT2's. I suspected the tires were the issue as the problem started after the new tires but the tire store replaced them with a new set and have the same issue. They were road force balanced and stock size. It has the chrome clad wheels, but I'm certain there isn't any trapped dirt throwing off the balance.

 

Oddly, I experienced the same vibration with the OEM Goodyears pulling a trailer with a load in the bed which I attributed to the trailer tires.

 

I've inspected the front end and can't find any loose ball joints, hubs, etc. There are no visible marks on the driveline, though it could be the U-joints. I pulled the diff cover and all seems okay.

 

I'm at a complete loss and the dealer isn't much help. any ideas would be greatly appreciated!

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