I made three mods sequentually. First the 3rd Gen Track bar, second the DSS, and third the Luke's Links. For me the 3rd gen track bar mod made the biggest difference. Probably took the steering wheel play from 5 or 6 in to 2 or 3 in. The DSS took out about have the remaining play (down to about 1 1/2 or so). The Luke's Links took it down to about an inch. That was all before an alignment. After the alignment, the steering seemed vague again. Moral to the story. What makes the biggest difference will problably vary depending on what is the worst on your truck and an alignment may make things worse. I also read on another thread there are two types of steering boxes in some trucks. Some boxes turn 4 1/4 turns lock to lock and others 3 turns. Apparently trucks with thee 4 1/4 turn boxes have a tendency to wander. Haven't verified it myself so you may want to look into that further.