再不行看看這個

Look on your steering column where the shifter mechanism attaches to the shifter cable. On the opposite side there is a rod that attahes to a little black box with a black electrical connector with a green keeper. Undo the rod from the linkage and see if you move the shifter and get the key to move. If that doesn't work there is a little cable that goes from the shifter mech to the ignition switch. This is what makes the key impossible to turn off while in gear. Undo the side on the ignition switch. Maybe that will help.
If not, make sure you have the park brake frimly engaged, then get under the truck. Where the tranny shifting cable attaches to the trans make sure everything looks right there.