The shifting problem sounds like a bad shift solenoid. As far as the noise, do you hear it when going over bumps?
As far as the maintenance, the manufacturer does have a schedule. However, even with that, you don't know when anything was done. What I recommend is this, check the fluids. Make sure they are clean and full. The transmission should be a redish pink color. PS fluid is more of a light gold color and nearly clear. I would suggest haveing everything serviced. That way you know when it was done and can move on from this point.
Let me know about the other questions.
Joe
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Thursday, August 5th, 2010 AT 10:25 PM