The track bar locates the body / frame in relation to the front axle. The most common way the track bar is mounted is from the passenger side of the front axle up to the driver side frame rail - not all vehicles are set up this way, but the concept is still the same.
When lifted, the body / frame shifts toward the passenger side. This is definitely noticeable with lifts over 4 inches - 3 inches to 4 inches is considered borderline. If the vehicle is already lifted, view it from the front and see if the tires are centered underneath the body. Some people try to correct this by sectioning and lengthening the stock bar. This is not advisable because of the expertise required. There are also brackets available to lower the stock bar at it's frame attaching point. The problem is that the amount the bar needs to be lowered (or lengthened) is seldom the same from one vehicle to the next. When using a drop bracket, you may get too much or not enough body shift. Another problem is stress created by the extra leverage of the longer bracket - eventually this can lead to stress cracks in the frame rail.
The adjustable track bars we sell solve these problems by mounting in the original location and having enough threaded length adjustment to cover up to 9 inch lifts on certain application.
