I'll let you know later today which transmission that i have . By erratic I mean it's about a 50-50 chance that reverse will engage or not . I'm on my way back to the shop to correct the engine codes . Apparently I have a cylinder miss on bank 2 , # 6 cylinder . I understand that I need to correct the engine issues and only then start with my transmission issues . I do appreciate your counsel as I am in no way anything more than a shade tree mechanic at best . I can change parts , but I leave the diagnosis to people that actually know what they are doing . Again , whatever the outcome , thanks .