I’m having same issues with my 2016 Sierra Denali with duramax. At 7k miles developed lots of slop in the steering wheel, took it back to the dealership and had the problem “solved” under warranty. Since then I have installed a 5” zone lift and 35x12.5 tires with -25 offset. Truck drove great for about 7 months and started to notice the slop back in the steering wheel. Just took it back to the dealer and said I was out of warranty with 21,650mi on it and said that the larger wheels are what did it and will cost me $1800 parts and labor for new steering box and pitman arm. I refuse to believe that a he can’t handle larger tires. And I have zero desire to spend $1800 just to get it back to stock and potentially have this issue again in a few thousand miles. Anyone have a viable upgrade solution to this issue?
