Hello, I have an 8.5 10 bolt with casting numbers JG G070 2, the measurments match that of my 68 camaro, but I have no idea what it's out of. It is not out of a nova, because it dosent match any of those casting numbers. I would like to know what it came from before i rebuild it. Thanks!


http://i171.photobucket.com/albums/u312/jleal68/8.jpg

Jose -

Okay, the stamp is definitely JG. The rest of the stamp is of the format GM started using in 1971 model year. If it measures the same as a 1st gen Camaro rear, then it has to be an X-body rear.

Knowing that, I googled each of the non- Nova X-body names (Apollo, Omega, and Ventura), and found this page:

http://ronspontiacpage.com/reference-pages/rearendcodes.htm

From that page, I found a JG code as a 1973 X body 2.73 41/15 JG

So, it appears to be a 2.73 open differential, 8.5-inch 10-bolt assembled the 70th day (mid-March, I assume 1973) at the Detroit Gear and Axle plant, night shift.

Thank you Eric! You have already been a huge help! I plan to put a posi in it, w/ 3.73 gears. Should all of these parts from a 73 nova 8.5 fit this rear? Including the rebuild kit? Thanks!!

Sure will. It's a "corporate" rear, common across the divisions.