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.
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What does your auto repair shop say might be the culprits?
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Little information and confusing at best. Please explain more fully and tell us how many miles on it.
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It seems OP changed their original post. now I am confused on what OP is saying. 
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