14sierraSLT

I just joined this evening and following the issues. Bought my truck in October 2016 with 16k miles. In the last two months I started to notice a vibration. I am now at 29k+ and on the highway the console and the passenger seat shake. No occupants experience the vibrations when sitting in the seat to my knowledge, but I have also not informed them of the vibrations. I also picked up on the vibrations by seeing a water bottle lose its mind in the cub holder. I can visually see lots of vibrations in the empty passenger seat by the shake it gives off during highway speeds. This truck did not do this prior to two months ago. I've gotten two tire rotations with the last two services and I purchased a balance recently since they said maybe the tires need a balance now that it vibrates. There was no change in vibration after the balance and rotation. My advisor informed me if it persists to call and setup a ride along with a tech.