8 3/4” carrier bearing preload

The idea is to measure how much the case stretches as a result of bearing preload. If the caps are spread .008-.010 apart that equals the correct preload. The picture showed the shaft of a dial indicator rod threaded into the bolt hole in the cap for the adjuster lock. With another rod over to the opposite cap and the dial indicator. Correct back lash and the correct amount of stretch and your are all set.