2016 Escalade vibrations, New tires new shocks still going on new spark plugs?
There is a known transmission issue. Look up 18-NA-355. That is the GM service bulletin on the problem. The fix is a transmission flush, replacing with Mobile 1 Synthetic LV ATF HP.
other things that can cause a vibration are bad motor mounts or transmission mount.
What does your auto repair shop say might be the culprits?
Little information and confusing at best. Please explain more fully and tell us how many miles on it.
It seems OP changed their original post. now I am confused on what OP is saying. .