Holyfetch

I know this post is old but for anyone looking to do this in the future I can confirm that this is possible. Regardless of what a dealer etc may tell you, it’s completely possible. That being said, have no idea if that means it’s universally possible but I was able to do it with my 2020, 3500 SLT crew cab…your experience may differ. I was also confident in tackling this as I used to own an auto glass repair shop and have the skills and tools still to swap the glass myself. Before diving in I first verified that I had the window motor pigtail behind the back seat. It’s located on the passenger side and was simply being held in place with the cable stay on one of the unused motor mounting studs on the back wall. Once I confirmed that it was there I opted to source the overhead console before ordering additional parts. That way I would only be out the expense for It, vs. the full $700ish it cost me to complete the swap. My original overhead console was the basic no frills version without the home link setup etc. I was able to pick up a version from a junk yard that had the home link setup and power sliding window button from I believe a 2021 AT4. Once in hand I was able to pull the original console out and test the new one. With test light in hand I was able to confirm that the pigtail behind the seat was receiving power from the new window switch, alternating power to either side of the plug depending on which way the window switch was operating. Based off this info I ordered all the parts I needed from one of the online gmc dealers and completed the install today. The only hiccup in the entire process was the rear passenger pillar panel had to be trimmed a tad to accommodate the track on the new window. There must be a different panel that went into trucks that have the window installed at the factory. But a bit of quick work with a utility knife I was able to trim just a tad off to clear. Otherwise everything was plug and play. And before anyone jumps on the “factory sliders leak” boat…I also completed the tech service bulletin on fixing the issue while I did the install. For me the convenience of being able to access my bed shell from inside the cab is far more important than the potential for leaks now. Especially as I’m confident in my skills in swapping the windows and completing the service bulletin as directed. hope this helps the next guy looking to do this swap in the future.