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I'm getting a weird vibration. It happens for only about 1 second at a time but can happen many times during a 10 mile drive. It sounds the same at all speeds. Doesn't happen when under hard acceleration, or when off the throttle completely. It only happens when barely into the throttle, like when trying to keep a constant speed. The vibration feels like a subtle version of driving over a rumble strip. Already checked the u joints. Truck has 123K on it.
 

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Andylad13, I'm having the same problem with my 2010. It has 187,000 highway miles on it. Even went to the expense of having a custom driveshaft built that is serviceable. The smoothness under hard or moderate acceleration is what is throwing me off. I have not found any solutions for it as of yet searching the web, but have seen where 2011-2013 have had service bulletins put out for this problem. I just haven't seen what the repair was. If anyone knows I would appreciate finding out.
 
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