I have a 1975 Ford truck that has power steering and it veers on it's own to the left and right when traveling down the road. I have changed the power steering pump, gear box, ball joints and tie rods and don't know what else could cause it to wander randomly. What else should I try doing to it?
Check the bushings in the drag link and pitman arm. Jack the car up and put it on jack stands. Have someone hold the steering wheel in one spot and have someone move the wheels back and forth. Do both sides. If there is any give in the bushings then replace them. If it is the idler arm then usually that ia replaced as a unit. If you find no problem there than check the allignment.