Vehicle is a 2013 Charger RT. I just changed the rear differential to a 9" with 3.25 gears. I changed the speedo in the scanner with the special functions tool to 3.73 gear and 28.1" tire. As soon as the vehicle starts to move I get P0731 and P0732 and the TCM no longer knows what gear the trans is in and it does not shift right. Is there something else in the tune I need to change, or do I have another problem going on.
