You would be proud of me then. I did it with a set of calipers and my eye *****

 

And marking compound?

 

I drove it for 100 miles, then pulled the cover and spray painted the ring gear. Rotated it a couple times and the wear pattern was almost dead center on the gear. Good enough for me . Put over 500 miles on it so far and it seems good. I can't hear if it's whining or not over my straight pipe exhaust .