Is there a date code on this tag?

EOT3-GA

 

That does not follow the usual "casting number" sequence that we all know and love, but may be a "part number". Since I am not familiar with part number codes, all I can say is the "E0T" part of it would tell us:

E = 1980s
0 = 1980
T = truck

It does not follow date code patterns either. Both can be found here:

Classic Mustang Part Number Decoding Guide

This also references the ID tag and decodes the date as I did above:

The Borg-Warner T18 & T19 Transmissions - Novak Conversions

If reverse is over to the right and down, it is a 1979 or older trans.

Can't find anything else about date codes.

 

Yep I scoured the internet too and came up with those same results. It seems I can be confident at least that it was manufactured in 1980.