Replace it all. I rr all the ball joints tie, rods on my ride. Now, the mechanic felt that the old parts were still in spec (they probably were), but when I frove the car, it felt much tighter. See, a little slop in one part may not seem like much, but add the slop from all the parts together and hey, you have major slop. Also, it is best to replace everything at once (you'll save on labor and alignment expenses).