I pulled the rearend out of my nova to do some repairs. I can't seem to find any numbers on the axle tube. It is a 12 bolt, the Ring gear is 3862526 10 41 4 69. Which is a 4:10 ring gear. I've scraped and sanded all the locations that they say to look for numbers. Is it possible it was purchased over the counter, and not originally installed in a vehicle? I'm more than anything just curious about the rearend. Thanks for any insight.