I put the same OEM mirrors but with powerfold on my 2015 2500hd Denali. I changed the mirror switch and the power fold works. My mirror lights do exactly what your lights are doing, I wonder if the dealer can fix this reprogramming the computer? Sent from my SM-P900 using Tapatalk
I did exactly what you describe to level my 2015 2500HD gasser (went with the Cognito UCA and Kryptonite steering rods). The ride is great, pretty much like stock. Good luck. Sent from my SM-P900 using Tapatalk
I raised my 2015 GMC 250hd 2.5" then installed a Cognito UCA added Blistien 5100 shocks with spacers and installed differential spacers. Rides level and better than stock. Good luck. Sent from my SM-P900 using Tapatalk
Make sure if you crank the torsion bars you look at the clearance under the UCA'S to the frame. I replaced my stock UCA'S with Cognito and the ride is amazing . Sent from my SM-P900 using Tapatalk