New guy here, I joined when I found this thread online... Here's my experience, I bought a 2014 GMC Sierra Regular Cab 4.3 2WD. From the very beginning I had a very bad vibration at 1400 RPMs, it did not matter the speed. I took it in and had the Service Manger ride with me. It was bad enough to shake the steering wheel and he could feel it in the passenger seat. He stated that it was pretty pronounced and not supposed to do that. First the sent the drive shaft off, that didn't fix the problem. Next they switched out the torque converter, still the problem was there. Its been in there shop over a month with GM Engineers looking and still not being able to fix it. Today they called and said they wanted to try and switch out a module in the transmission. I finally lost it, I went into the dealership and told them I'm done, refund my money and I'm going to Ford across the street. They are buying my truck back from me tomorrow and are delivering me a upgraded model to fix the problem. I have a open claim with GM Customer Service, I called them today about the issue and it was a HUGE waste of time. The girl was foreign and I could her someone in the back ground telling her what to say. I was pretty shocked at the Customer Service, she didn't know how to do anything including speak English. I'm hoping that the new truck will not have the same problem, if so I am done with GM. Back to Toyota I will go.