TechmanBD: You most likely had the 4L60-E or 4L65-E depending on the year.

Bored out: you are right that the GTO is a pretty good deal. I'm not the craziest of their over used exterior styling but I love their interior, I just wish they wouldn't have gone so overboard with red!

Patrick: None the less you can still google it and find some cases. It was pretty wide spread.