Run the numbers on your T5 to see if it is a world class. It may have a sticker on it with recommendations for the type of fluid, you should follow them. Check out this site.
http://www.britishv8.org/Articles/Borg-Warner-T5-ID-Tags.htm


1953 Chevrolet 3600
Fried Green T'mater (Vern)
In the Stovebolt Gallery
Caution: Political Statement
Man who runs in front of car gets tired, man who runs behind car gets exhausted.