I have a 12 bolt rear and the casting in the webbing is A 8 9
On the axle tube it looks like KD0116B

Thanks

KD Looks like a 2.73 Posi (http://www.chevelles.com/years/69/69rearcodes.html)

A 8 9 - would probably be Jan 8/69.

0116 - would probably be Jan 16

Hope this helps.