Hy jon, I agree with most of whats been said here with the following exception, your freeplay should be removed with the wheels in the straight ahead position only, the steering box is designed to be tighter in the straight ahead position, it gets progressively looser as you get to the end of its travel. As for lube I would not use any type of "grease" I would use whatever lube the manual recomends, or the brand name lube mentioned in the other posts, "grease will not flow into the ball nut circuits and thus the balls and grooves will wear, hope this helps.
