Kickdown issue

TrailBeast said
Haven’t seen that one specifically, but yes that is the idea.
It’s an add on to the valve bodies that don’t have it and is really easy to add.

I added one when I had the 904 in my Dart and it was night and day difference for kick down.

Hope it's something simple like this. As it sits now, mine doesn't have the function at all. I've tried flooring it from various speeds above 40mph.