Part Throttle Kickdown

After reading Leaburns testimony about having Part throttle kick-down, I'd like to hear what folks who have it, have installed to make it work. I'm hearing that the complex valve body type will kick-down 3-2 at 3/4th throttle, and the simple VB type will kick down at 7/8th throttle. Does the complex type bolt to the simple valve body?
Author: carrman