I have a 01C 67rs It had a 10 bolt that broke on me back in 88. I got a 12 bolt from a Friends dad at the time for $200.00 it was a 12 posi with 331s He said it was from a 68 Z how he knew that I don't know must of knew the car. I looked up the numbers on pass tube as follows
BS 1112G2=31 12 POSI NOVEMBER 12 G=DETROIT AXLE 2 ND SHIFT. I have a letter E and a letter H stamped below the other number but they are all sideways and goofy? what gives with that? I have attached a pic what does it mean guy goofing around on the Line maybe.