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Q: Why does this truck vibrate so much? on 2012 Chevrolet Silverado 2500 HD

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Been to the dealer 5 plus times for my vibration in my truck. The passenger seat will shake. The cub holders will shake when they are in use. The dealer has replaced the tires, force balance the tires several times and replace 2 faulty drive shafts. They claim these truck ride rougher than the 1500 trucks. My truck has 20" rims (factory) Z71 package, ext. cab. From what I reach search so far, there is a lot of complaints about this. Is there a solution. I file complaints with the Chevy customer service, but that is a waste of time. The truck has been in the shop after the first 1800 miles on it, and I'm on 33,000 miles and mad as hell that no one will fix it.
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They claim its fixed. Its normal for the trucks to ride like this due to the heavy duty suspension. Still looks funny to watch the head rest on the passenger seat shake and the cup holders shaking my drink for me. Chevy customer care keeps telling me that if the dealer says it fix, its fix. Starting to look into filing a report with the BBB. $43,000 for a vibrating truck is not what I paid for.
Just curious , but what pressure are they running in the tires......And is it more of a road feel 'harshness' maybe? Try loading it down a bit (1/2 ton of sandbags or something) in the back ,and see what difference it makes........The truck was designed for 'work' , so make it work and see how you feel at that point.???????.just a thought.
Had 2400 pounds in the bed today. ,the water bottles hardly shook at all in the cup holders. But the ride wasn't any smoother. The tires are set at factory recommendations. I believe around 64psi in front and around 72psi in the rear. Already looking at trading it in for a crew cab. I'm pissed Chevy would let a truck like this be sold, but there crew cabs have a longer frame and a smoother ride.
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