4500rpm is redline in neutral/park the car can shifter better than you can (it's electronics are gonna counter-act any good you could be doing), so just leave it in D. if at track, maybe turn o/d off,,, but manually shifting an atx is useless.... and get a superchip,,, and my speed limiter was 112 mph, why's everyone always saying stuff like 106 and 107 for the limiter?
