When adjusting that valve body (on top of the gear box), I highly recommend not just having the front wheels off the ground, but to have the front wheels removed from the spindles. You want as little friction (weight) as possible so to assure the power assist of the left-right-left-right action is at a minimum of the gear box.... IF you wanted to go a slightly different and better route, you could alternatively disconnect the Pitman Arm from the steering link cross-arm (letting that hang)... again, reducing all possible friction from the gear box. That's how I've done it in the past... best results!