Yep, I already changed the steering stabilizer.

I looked at the steering mechanism while I was changing it, the shaft attached to the steering wheel can turn freely for a few degrees, while the pitman arm is still as a rock. The steering stabilizer attach to the pitman arm end of the steering box, so that was not the problem. I think something is loose in the steering box.

Hey MikeR, what does "Repair as necessary" means? haha~ a trip to the shop?