Poop...how much to get a trak-lok rebuilt? Reply #15 – January 01, 2006, 06:45:13 PM If you change to a new diff assymbly, you will change your backlash setting, and the ring&pinion contact pattern. The easiest way to do it is to buy a repack kit, mic your original clutchpack shims, and use the shims included in the rebuild kit to pack it a couple of thousandths tighter than factory. Quote Selected