Its a simple fix. the problem is corrosion between the kickdown shaft where it passes though the selector lever shaft. When the throttle is moved far enough to activate the kick down linkage it moves the shift selector. It took me a while to figure out the 1st one I saw. Remove the air cleaner,battery and battery tray. Have some one floor the throttle(engine off)you will see what I'm talking about. You may have to unbolt the arms from the trans and /or remove the E ring from the top of the shaft in severe cases. Some PB Blaster while wiggling the levers back and forth should due the trick.
Doug