Rear axle year?

[Froh]

I picked up a gbody rear axle for one of my projects, but am unsure about what year it is from. I would like to know 'cuz when I go to order parts the guys always want to kn
ow what year. I can't find any charts that help.
The stamped codes on the right side tube are no help, does not contain the year. It is a 3.08 (had the cover off), code 2AC C218 2, 12mm lugs. I'm assuming later years of '78 to '88.

 

[ELCAM]

2AC comes up as 3.08 non posi for 1984, 86, 87and 88, see what the date codes cast into the housing says for the year. The C is for Chevrolet Buffalo plant, built the 218th day of said unknown year on 2nd shift.

 

[Froh]

Yup, it's a 3.08 non posi. So, the date code is cast into the cast iron diff housing? Where would that be? All the searches I do only show the info stamped into the right tube.