I have a 2000 GT auto and I just had my O/D light start flashing so I hooked my SCT tuner up and it thru the code p0781 1-2shift code. My car is NOT shifting any different, not hard, no noise or anything. I called american muscle tuning department and its weird considering it shifts normal. I am going to return the car back to stock and see if the problem persists but I want to know if anyone has any input on this issue. It started happening a day after a coyote came out of the ditch and t-boned me in the driver side door. It just hit my door and a little bit of my front wheel well. I hope its not a big issue but we will see