I have a 90 YJ that had a 3" spring lift then I added new heavy duty shackels which added an extra inch. I checked to make sure that my brakelines are not binding, they have already been relocated. So nothing looks like a brake line problem to me. I have also replaced the front passanger brake caliper thinking it was dragging and causing the pull. It helped but has not fixed the pulling problem. I am running on BFG A/T 33x12.5x15 and all 4 sit at about 28psi.

Any suggestions?  

maybe the left caliper is weak or sticking...could also be a plugged line. but usually in that case it causes the brakes to drag and get hot.