Ring and Pinion Question

Hmmmm. It might be possible (some would say probable...including my wife) that I'm wrong on that.

And now that I'm sitting here, trying to remember the last two gear sets I did (5.57 for my race car and some 4:30's for a buddy) I may be wrong. The pro gear is softer so they may have the tighter back lash.
I am not saying your wrong, just telling you what's on the gear set.
I have done maybe 3-4 gears sets in my life which is not a lot, but I cannot say I have ever seen a backlash setting etched on the gear set, so who knows. I,ve had some that did not even have a depth setting etched. These Richmond pro gears have both.