Turn radius to the left

did you center the box shaft before you installed the pitman arm? Not sure if the new fast turn pitman arm is clocked or is it universal. take the pitman arm off, turn the box lock to lock and count, divide by 2 and return to true center. then mount pitman arm to straight suspension. should be pretty close to centered. Then you can adjust minor difference by tie rods

I think it is splined so that it can only go on one way