Does anyone know what this code is?

WEll took my 70 into the body shop today to have the body removed. And i am starting to get my chasis stuff and running gear ordered. This is my first car that i am gonna build so its a giant learning proccess for me. I was wondering if someone could help me with the code on the rearend. This is the code stamped on the rear end cga 04 1b2, Is this the code that i need to find out what gears are in this thing. The other code stamped on it is 3969277nf. Thanks.