I have a 2014 Silverado 4x4 LT with the high speed shakes... I bought it used, so I really get the shaft when I try to bring it to the dealership and get this fixed. The service manager told me this is normal, and his truck does it so get use to it. Then I brought it to a ring-and-pinion shop. They were no help, as they wanted nothing to do with diagnosing this problem. They blamed it on the suspension, and that automakers are trying to make all their light duty trucks ride like a car. My '02 Z28 feels like a frickin Caddy compared to this truck. One thing I did notice, is when I put a little bit of weight in my bed, I get a better ride.
I'm just going to throw some money at this thing soon, and seems like a new custom built steel driveshaft is my best 1st option, with some new shocks.
Maybe RAM can take over GM as number 2 truck sold, and wake them up. Quality Control in GM is questionable at best right now. AAM isn't far behind.
813 pages later.... Thanks for all the info guys.
