I have a 2016 Silverado 1500 LTZ 4WD with roughly 93,000 miles. While in 4WD, my truck has harsh gear switching. It also lurches really badly. When I was making a sharp right turn at low speed, around 5mph, I could feel grinding, and my truck had a lot of resistance to go forward. In 2WD, it mildly shutters and shakes, but is fine when I floor it. It shows none of the issues it has in 4WD.
I'm thinking that the truck may need a transfer case, and transmission flush, but I wanted to know if there was anything else I should check, as well, or if anyone knows what is going on. The truck already had 85,000 miles when I got it.