Bouch cable

I think you need a Chrysler throttle shaft adapter to get the correct ratio of movement between throttle cable and transmission throttle position cable.

Currently your throttle cable travels more distance than kick down cable can move. You need to move the kick down cable attachment point on throttle lever closer to its shaft. In other words, radius from center of throttle shaft to throttle cable needs to be longer than radius from throttle shaft to kick down attachment point.