Every GM vehicle whether it has a 6 or 8 speed transmission suffers from this. This is present across different models from Cadillac, GMC, and Chevy. Here's a thread that explains the issue. Please read through the thread before you come back and gripe.
http://www.ctsvowners.com/forum/showthread.php?t=81377
If you search other GM forums, they are having the same conversation. GM just sold more trucks, so we b1tch more about it.
Here is the service requirement .... 3x transmission flush, Mobil 1 Full Synthetic ATF with the option to replace the TC if present after 200 miles. GM has been fixing this issue in Escalades since the (2014-15) model change. Same platform, different tax bracket.
Torque converter shudder. Bulletin 16-NA-175.
Forget the tires, shocks, leaf springs etc. Those are quality issues. But don't take my word for it. Search according to your transmission type add torque converter shudder and it will lead you to
Bulletin 16-NA-175.