I am having some issues with my Steering Wheel Shaking/Wobbling at speeds above 30mph. I thought it might be wheels or tires so I replaced them, and it was still there. I took it to a Mechanic Today, and they said the Wheel Bearings just needed packed, and it was fixed. Unfortunately I picked it up at closing time or I would have taken it back. It still does it. If I am driving straight it does not do it, but if I move the Wheel to either way just the slightest it is a horrible Wobble. There is no play in any Ball Joints, Tie Rods etc.

Any Ideas?