I am using the original 1966 727 transmission. I unfortunately found out about the externally balanced torque converter after I had gotten rid of the torque converter from the 1977. If I go to a transmission shop and tell them that I need an externally balanced transmission for a 1977 727 powered by a 440 engine will that be sufficient information? Do I need any more information to get the correct unit?

I greatly appreciate all of your help! Thank you.