Park is operated by linkage, get it to work before messing with the kick down. Unhook all your linkage with the wheels blocked, and manually shift the trans to park. Remove the wheel chalks and confirm its in park. If its not, you have internal problems. Place your shifter in park and check the linkage line up, then move the trans to low by hand and then the shifter, check the linkage again. You should be able to tell if what you have is going to work or not by how the hole and shift rod line up. Now is the time to correct any short comings.
The kick down is controlled by a electric switch on the throttle or carburetor linkage. You can adjust the position of the switch to trip at any point by moving it along the travel of the linkage.
Joe
