The Track Bar is a bar that connects the chassis of the vehicle to the axle.
The purpose of the track bar or pan rod bar is to control the left to a right offset of your axles. Some vehicles use two track bars to align your axles. One track bar for the front axle and one for the rear axle.
Track bars are available in both fixed or non-adjustable and adjustable versions. NonAdjustable track Bars about on vehicles with a stock ride height. Vehicles with increased ride height will require the use of an adjustable track bar to ensure the proper alignment of the axles. The track bars attachment points at the left and right side of the trackbar allow for up and down motion while restricting the side-to-side movement. The track bar is what keeps the axle adequately aligned with the frame. By raising or lowering your vehicle's ride height, you move the axle left or right in respect to your vehicles center-line. The adjustable track bar lets you recenter the axle, so it is equal distance from right to left. Having your axle centered and positioned in the center of the vehicle as opposed to being out of alignment ensures prolonged tire life.
A loose track bar allows the axle to shift its alignment under load in relation to the chassis. The Track Bar is considered a wear item and the bar ends tend to wear quickly depending upon the materials used.
These are some of the other names a Trackbar is known by: