1973 Other Chevrolet Models ajusting crush bushing on pinnio

Drive Train Axles Bearings problem
1973 Other Chevrolet Models V8 Two Wheel Drive Automatic

im replacing pinnion gear and I need to know if gm goes by a spicific tourc on the lock nut which sets the pinion to ring gear clearence or if theres a gage which is aviable there has to be a way while producing rear ends that the manafactures uses to save time and have a high quality product