99 F250 4X4, 160 K miles
As the title says, the steering wheel can oscilate left & right while going straight ahead. If you hold on to the wheel, you can still feel it. What tends to start this off is a left turn. Right turns tend to stop the oscillation. I'm thinking this is a hydraulic problem, but I am open to any suggestions. Also noteworthy, with vehicle stopped, turning the wheels left you can feel a bind or hard to turn point; turning wheels right with vehicle stopped is normal through steering travel.
Any help out there?