Just saw this post after being pointed to it. Don't know if this is still needed but here it is. I can't figure out how to post a pic from my computer....
69 Z/28 X33D80
Official NCRS build date August 19, 1969
Rear axle codes and casting numbers.
C BU 0815G1 E
3969341 NF date code G 23 9 July 23, 1969
69 Z/28 X33D80
Official NCRS build date August 19, 1969
Rear axle codes and casting numbers.
C BU 0815G1 E
3969341 NF date code G 23 9 July 23, 1969