Reading the description they do not include the Ford AOD in the list of trans that this kit would allow you to shift or hold gears as you want to:
"it provides additional driver manual control (GM TH-400, 350, Ford C-6 & Chrysler Torqueflite only). Most stock automatic transmissions won't downshift into low gear above 15 mph, and automatically upshift at a predetermined speed no matter what gear you're in. With the Transpak, you can downshift at any speed, and you can hold the transmission in first gear to any speed that you want!
The only way to do this that I have seen is with a custom VB for the AOD.
Jon