Now, with respect to whether your axle is centered, I would be shocked if your axle shifted very much at all with just a leveling kit.
In any event, measure how much your front tires stick out from the fender on each side. The numbers will probably be a bit off because of the leveling kit (maybe 1/4" tops). Not enough to worry about in my opinion, and certainly not enough to spend the money to buy a new trackbar setup or brackets.