I believe you need to contact SCT to have your programmer re-assigned to you. There is software on the unit that keeps you from being able to jump from one vehicle to the other. SCT has put 4 or 5 "unlocks" on the unit but you have to contact them to get it switched. Once you get in touch with them, they will assign your truck strategy and serial number to the unit. I believe that's all you should need but others will correct me if not.