Quote Originally Posted by tayto View Post
the vin is more accurate for figuring out year vs the manufatured date
eh? yes, the vin does tell what MODEL Year it was built for, it does not tell the manufacture date though normal decoding.
What does that have to do with what ECM it has?
I have a 1993 Model year that had a dealer replaced ECM, that just so happened to be a '7427. I even found a late model year '92 with a '7427 at the salvage yard.
GM does supersede ECM's for various reasons, so it is not all that unusual to find one in anything from '92 to early '96 depending on the vehicle model.