I drive a 97 ranger 4cyl xl. Today i got inmy truck and went to turn it over to start. The Key unlocked the ignition and then the tumbler went loose. Wont crank to start when i mean loose i mean you feel no play at all. I can turn the key and lock the steering wheel but thats it. I had to pop the hood to turn all power off.. Whats wrong with it? what part do i need to buy?