Anytime you lift a vehicle, half an inch or 5.5" it changes the original geometry of the steering. That being said, it is not necessary to get a drop track bar bracket for most lifts under 3.5". Depending on how much it moved would determine if you need that or not. If it is a substantial amount, then yes, do it. If it is minimal, then I wouldn't worry too much about it. The one thing that you will pick up is "bump steer" with a raised rig and different angles. If it makes you feel better or you can fab up one fairly easy, then, by all means, put it on. Some rigs will get the bump steer worse than others. Mine, for instance, didn't require me to put it on for the 3.5" lift. I have a set of 5.5" coils in my garage that are waiting to go on, and when I do put them on, then I will get the drop bracket and do a tie rod over or drop pitman arm to correct my angles.