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I would say it isn't locking all the way. I can't tell you why without seeing it but try pushing in on the door while you turn the key. You should be able to feel or hear an audible click when it locks. If it locks when you push on the door you will have to push in on it to unlock it also.
Look at the pictures I posted in this thread:
http://67-72chevytrucks.com/vboard/s...d.php?t=425488
There is a right and left so make sure you have the correct lock in the correct side...
Let us know what happens.
LockDoc