Originally Posted by long-gone

Tie rod ends aren't too expensive so if you can afford it, replace them all. If you just do one side, replace it as an assembly. Before you drop an assembly, measure it carefully from the center of one stud to the other (I used a wire looped around each stud and taut). When it's out lay it on the ground and match your new ass'y up to it in length as close as possible, then when you install it (loosely) finish by matching the previous measurement as exactly as you can. If it needs adjustment you can do this by turning the center rod adjustment (which spreads both ends at once) or if it's only a few threads off, pop the outer one and turn it out until the measurement matches.
You should get an alignment afterward. When I did mine, the car went quite straight with no shimmies, vibrations or handling issues so I never got the alignment.