I have this same exact problem with my 2017 truck. It has a 6" suspension lift with 20K miles. Only vibrates under acceleration in 4 wheel drive or auto only.
What is actually the problem/slash fix or is there one? Is it the front driveline angle? Front CV shaft angles?
Same issues here on my 2017 Z71 SCA Silverado.
So you raised the coilovers up 1.75"? My truck sits flat now. By doing this, it'll make it look like one of the squatters. Just higher up. Right??