The Aeroflow Performance Ford 9" Powertrax assembly is the latest design in traction control. Utilising 3 x 2 spiral gear technology for smooth, dependable operation that combines limited-slip characteristics from gears contained in a machined, forged steel centre housing. The Powertrax delivers progressive & variable traction releasing tension on the centre to turn corners while locking up to put the power down through both wheels in a straight line. Suits OEM 2.875" and aftermarket 3.062" bore cases. Available in both 28 and 31 spline.