Trans fluid question Need help

What is the best trans fluid to use in a 55 Dynaflow? It was rebuilt a couple of years ago and just want to make sure the wrong fluid isn't going into it.

 

What I need to know is should I run some kind of Dexron or something else for the older trans? Anybody????

 

http://www.secondchancegarage.com/public/725.cfm

not sure if that helps, but it's relevant...

 

I never knew that, thanks for the link. Looks like I'm going to have to do some whale hunting tonight!

 

try here it looks like plain ol dexron
http://www.jalopyjournal.com/forum/showthread.php?t=159773

 

You would be okay with Dex III