If the steering binds while turning and the pitman arm is removed, what is a possible cause?

When the steering binds while turning and the pitman arm is removed, it indicates a malfunction in the steering mechanism. A binding steering shaft U-joint is a likely cause in this scenario. The U-joint allows for flexibility in the steering column while transferring motion from the steering wheel to the steering gear. If this U-joint is worn, corroded, or improperly lubricated, it can create friction or binding that prevents smooth steering movement, even with the pitman arm disconnected. This can lead to a sensation of resistance or binding when trying to turn the steering wheel.

The other potential causes, such as binding ball joints or tie rod ends, would not be relevant in this specific context since these components connect different parts of the suspension and steering system. They could affect the overall handling of the vehicle or contribute to different steering issues, but they would not directly cause binding in the steering column itself when the pitman arm is not connected. Therefore, the binding U-joint in the steering shaft is the correct answer because it directly impacts the steering operation.