Just finished replacing the steering Box and the entire steering linkage while reusing the center link. I have this issue where the when the wheels are straight the wheel turns but perfect to the right but when it goes from straight to anywhere to the left it binds super hard like almost impossible to turn. I have disconnected the Pitman arm from the center link and tested the Box and it turns perfectly fine without being connected. I bled the power steering system and checked all the lines and hoses and there's no kinks and no bines and any of those and it sending fluid perfectly fine. There is no aeration in the power steering fluid. Any ideas?

 

Here's 1. Tell people what you drive.

 

Typical problem in a case like this is the steering shaft u-joint(s). Easy to replace the shaft but get a good one or the problem will be right back. Plenty of cheap ones on ebay.

And Yes, a description of the truck is always helpful.

 

Check for other components for a bind such as ball joints.