Has something to do with the power steering. I can't remember exactly what, but its a common problem. If your in park, foot off brake, can it turn? then try it with foot on brake. I want to say it is a weak pump or possibly collapsed lines. If I remember correctly, a new pump will only do the same thing in time. I've heard of people going to a hydraulic assist to cure the problem. My truck is extremely hard to turn with foot on brake, but turns fine without brake. Just something I've gotten used to, unfortunately...
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