Hardrace Rear Adjustable Track Bar V2 Adj Lift 0-4.5"The rear track bar controls lateral movement of the axle housing. When you setting your ride height, the fixed length of the OEM track bar will not fit height adjustments. This will results unnecessary stress on suspension and alignment problemsHARDRACE adjustable rear track bar allowing your suspension parts to work accuracy and set the alignment correctly and easily. . More direct energy transfer and feel . Constructed of high strength steel alloys