what was you issue with superlift. i had their kit on my dodge 2011. quality was great but i had some vibration issues that i think was just a dodge issue. they gave me some issues but eventually came to a resolution. shocks that came with the kit sucked, but they upped me to bilsteins for free. i was considering their 8 inch kit for my 15 or the 6.5 inch from zone.
I have my vehicle in for the second service regarding this issue today past the Pico scope and they tell me at the vibration that they admit they feel is within normal means when the video that I have clearly shows otherwise I took both the service manager and the foreman for a ride they both can feel the vibration the foreman will admit it the service manager says he doesn't feel anything out of the ordinary that sets it apart from any other truck I'm at a loss at this point because they aren't willing to go any further with it being as it passed the test the truck is a 2015 Silverado LTZ 20 inch wheels with 8 thousand miles.