1. Start the engine
2. Put transmission in N
3. Put t-case in N
4. Put trans. in gear to verify t-case is in N
5. Turn off engine
6. Put trans. in PARK
putting the trans. in park with the engine running could damage the trans.
you'll also need to shift the trans. to N before starting engine to reverse the process.
also, you'll tow with the key in the off position, but not locked. that's one click forward from where you put the key in/take it out.