New Adjustable Track Bar for 66-75 (if you have a 76-77 Bronco, please look at my other auctions for this style) Classic Broncos. The tracking bar on Early Broncos is mounted to the driver's side bottom of the frame and connects to the passenger's side of the front differential. It plays an essential part in the handling and drivability of the 66-77 Ford Broncos by keeping the front differential centered under the Bronco frame. If the front differential is not centered under the frame, the Bronco will want to wander all over the road and will be especially likely to pull when driving over bumps in the road. When you install a suspension lift on a Bronco, the change in height will also change the geometry of this bar, causing the tracking bar to pull the differential over more to the driver's side. This tracking bar has an adjustable thread incorporated in it to allow for adjustment of the overall length of the tracking bar. This is useful in compensating for the shift in the differential placement caused by the suspension lift.