contact pattern

Thanks, Is it even possible? example: An uninformed soul, has a 3.23 open 89 case, wants a sure grip, buys a carrier with one, and 3.55 ring gear. would the teeth be close enough to even mesh?

I'm not sure they'd even mesh at all doing that. Depends on how their cut. I know for sure that ring and pinion gears are lapped together as a set and you can't mix and match them and expect a good pattern