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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.
A Mustang's Panhard Bar Explained. The main purpose of a panhard bar is to provide lateral stability to the rear axle. This was intended to be the job of the upper control arms, but they are just not enough.t is the perfect solution to solving the common problems found in the 1999-2004 Mustang's four link suspension. Ford decided against putting a panhard bar on this model from the factory, most likely to save money. Now, you can find a panhard bar on all '05 model Mustangs.