Hi
So I took my truck in. First thing they did was swap out to a new set of tires and rims from a 2015 silverado, I went out with the mechanic that had a harmonic vibration analyzer. Guess what no vibration what so ever, right to the cut off limit 6 times over and she was smooth as a Caddy.... grin (very happy). My dealer said 2 tires needed to be replaced on my truck which by the way are after market. Mine actually have a hop to them when you run it on the balance machine funny they balanced out almost perfectly. He also said one of my good tires was out.50 oz but ran truer on the machine than any tire he has come across lately ... Go figure, I called my after market tire dealer and he says lets rotate the 2 tires 180% to see if that fixes the problem before I warranty the tires which will need to be ordered 10 days out 2 hr drive each way. Mental note, buy local and pay a little more now or even more later. I hope this info helps some others here, let's really check these tires out.......
I mean get the balance guy to run them in front of you so that you can see for yourself if the tires are no good or are running true. My mechanic said he sees bad tires all the time or overtime they get messed up (belts inside the tire are weak and deform). Sometimes a tire balancing tech never looks at the tire and solely relies on his machine, sure it's balanced. However the tire isn't round causing a hop condition. Balancing guy insists the tire is balanced and hey it very well might but that doesn't mean the tire runs true.
Maybe I just got lucky here and it was only tires in my case, I am very happy with the result and love my truck again.
Hopefully everyone here will get their vibration issues resolved.