GMC sierra 2002 User Manual

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2. Move the shift lever into PARK (P) position 
like this:
D Pull the shift lever toward you.
D Move the lever up as far as it will go.
3. Be sure the transfer case is in a drive gear 
--
 not 
in NEUTRAL (N).
4. Turn the ignition key to LOCK.
5. Remove the key and take it with you. If you can
leave your vehicle with the ignition key in your
hand, your vehicle is in PARK (P).