The first step in rebuilding a quick change rear is having the right tools. DMI has produced the industry's first complete tool kit to rebuild all brands of quick change rears. Precision dial indicator to measure ring gear backlash, made in the USA torque wrench for rotational pinion preload and all the sockets, wrenches and fixtures to rebuild like the pros! Complete with instructions. Kit includes 6 and 10 spline pinion sockets.