Jsb55

Got all 4 tires road force balanced at my dealer and finally got on the highway today, was only for a couple of minutes, but no vibration all the way up to 80mph. Dealer said both front tires were out of GM spec and needed some weights added. Hopefully it stays smooth and doesn't come back!

I had a 2014 Z71 crew cab 4x4 Silverado 1500 that drove awesome!! No vibrations, transmission great and was happy. My wife has the same in a GMC and is great also. Well with all the rebates going on I decided to trade in for a 2017. Same truck just with different tires and I have the dreaded vibration starting at 72 and ridiculous at 78mph. Going in the shop for road balancing today.

I just got the Ionic Voyager running boards. They are a 6" running board close to OEM bars. I got the chrome ones delivered for $356. Definitely changes the way you get in and out of the truck and catches a lot of the road debris. I have a long stone driveway and I think this will stop a majority of the stones from hitting the truck itself.

Cap'n Pete.. My '14 shifted smoothly when I got it.. After the update it would hit hard from 2nd to 3rd.. A very noticeable difference. After driving it for a few more days it is better as its only noticeable when the trans temp is still cold and goes away once it reaches about 100 degrees.

Good to hear that your shifting is back to where it was before. Mine jumps in and out of V4 and V8 A LOT more!! Kicks into V4 and lugs the truck into low rpms and then downshifts to get going again. Hopefully the tranny gets back to normal and gets rid of this.

I had mine done also and feel the same thing. Did yours get better? Mine seems a little better but not like it used to be. My truck also goes into 4 cylinder mode more........

Here's my Z71..