A shift kit won't change the actual shift points, just the firmness. The shift points can be changed by messing with the TV cable or by changing the governor springs. The TV cable method can work, but it may cause problems in reliability if the line pressure is too low. In my car, I just shift it manually and since I have a shift kit and the TV cable properly adjusted, the shifts are immediate and firm-it even barks the 1-2 upshift in automatic mode. Raising the shift points with the TV cable can make it ride the lower gears too long at part throttle. It may even slip the clutches and bands due to low apply pressure and kill the transmission in a short time.I admit that transmissions are not my forte, so someone else may have a better solution or be able to shed more light on the subject.