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