There is currently no recall on the transmission even though at any given time in the last year (or more) there are 2000 vehicles waiting for the valve body. Obviously GMC doesn't issue a recall, even though this is a known problem, because they aren't allocating many of the redesigned part to current owners. Most go to producing new vehicles. They already have our money! Please file a complaint with the NHTSA at this link. https://www.nhtsa.gov/vehicle/2022/GMC/SIERRA%25201500%2520LIMITED/PU%252FRC/2WD#complaints
Maybe we can save others the headaches, possible injuries and out of pocket costs that we have incurred. Also if there is a safety recall I'm assuming GM would be forced to replace the transmission if parts are unavailable. This is something they are refusing to do now even though people have been months without their truck. The process is anonymous when you file a complaint and the NHTSA could force GM to initiate a safety recall.