Check Differential Backlash with Dial Indicator

What happens here

The presenter sets up a dial indicator on the differential unit to measure the backlash. He then manually rotates the gear to observe the needle's movement, indicating the amount of play. He mentions having to consult online resources to find the correct positioning for the dial indicator and the acceptable range for backlash, as he is unsure of the exact specifications for this particular setup.

Goal: Measure the backlash in the differential to ensure proper gear mesh.