I think it is a tv cable issue...when I am cruising at 55mph and step on it (pedal to the floor) it stays in OD for a few and around 60mph it will drop back into 3rd and get up and go. Is this a tv cable issue? I am guessing I need to tighten the adjustment, but I set it the way they tell you to where during moderate acceleration 1-2 shift (10-15mph), 2-3 (20-30mph), and overdrive at 40-45mph. What do you guys think?