[70inbville]

I have a 4l80e and the tag starts with 1 and I'm not sure of the others letters, my question is; is it an 91 or 2001 ? the cooler lines are one front one further back. I read that earlier models the cooler lines were over top of each other and towards the front??? I was under the assumption this was an 91 until I read about the lines soooo would the white tag say 01 or just 1 for it to be an 2001?

thanks,
Chip