identify a 700R4

Hi. I have a transmission, which I am told is a 700R4 from an 89 pontiac Parisian. Currently trying to sell it, and was told it 'may' be a 200.

Can someone tell me an 'ironclad' method of identifying if this is indeed a 700R4?

Thanks

EG
http://i304.photobucket.com/albums/n...lone/trans.jpg

Try comparing it to the ones on these charts. You should be able to ID it from these.