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The purpose of a trackbar is to prevent movement of the axle/wheels from side to side. The adjustable trackbars will keep the axles centered (left to right) under the vehicle once lifted. Think of it as a right triangle. The axle is the base of the triangle, and the trackbar is the hypotenuse (diagonal line). If the vertical rise changes but the base does not, then the hypotenuse (the track bar in this case) would have to change or be adjusted to compenate for the new vertical height. If the trackbar is not adjustable then the axle will shift more to one side and no longer be centered under the vehicle.
How a sway bar works. Every sway bar is a torsion spring â a piece of metal that resists twisting force. The sway bar is attached at each end, one end to one wheel and at the other end to the opposite wheel (both fronts or both rears) so that in order for the wheel on one side to be higher than that on the other the bar has to twist.