Okay, I know this has been covered before, but I ran a search and I couldn't find it. I know the 700r4 isn't the strongest tranny, but I need the OD, and I'll be rebuilding it with the B&M Transpak kit. How can I tell what year 700 I'm looking at, I know it has to do with the casting number, but I need more info. And, what year was it when the 700 was improved over the previous years? Thanks. It's not what you buy, it's what you build!