8.75 Pinion Checking Distance

Hello, I am trying to find the spec on the 8.75 Checking Distance for setting the Pinion Depth.

Setting up a new case with swap meet sourced gears and case.
Gears have no stamping of + or - and no checking dimension stamped on gear either.

Thanks for your help.

I know How to set with pattern, I just wanted to save time by getting the distance correct first.
Greg
If the pinion has no marks you need to guess. What case and what manufacture of the gear are you dealing with?