Is there a such thing as this list????

[sra_chipmunk]

Are transmission stamped with a S/N or a code to identify whether or not they are an HD trans, witch year the trans is, etc, etc. I am looking for a some type of list (if there is one out there) of those numbers.

[Scimmia]

Yeah, there's a list in the front of the ATSG manual

[agrazela]

If I understand correctly what you are looking for, you will find it here:

GM FWD Transmission ID charts