disconnect the knuckles from the turnbuckles and see if they rotate freely, they probably will, so my money is not on the steering post bearings/bushes, but more like the screws that hold the steering plate to the Servo saver have not been fitted correctly and that there are 2 bushes and/or washers missing from there.

Also make sure the plate is not warped and catching on the front gearbox where the diff pinion goes through.