I connection with my rear axle rebuild I managed to source a used 3.67 ring & pinion which seller claimed was checked and in good condition. I took the crown wheel off the carrier and gave it a good cleaning. During inspection I noticed what I would consider very minor pitting on the tip of a single tooth, otherwise it looks to be in good condition (layman terms).
Due to my lack of knowledge with this type of parts, I kindly ask the professors on the forum to tell me if I should be concerned. Pinion looks to be fine.