<VV> 1964 powerglide transmission still leaks a little, where?

[Ignacio Valdes]

Hi I've replaced the main transmission gasket and the shift push rod o-ring
down low on a 1964 dual carb powerglide. The transmission still leaks a
little from up above somewhere. I am told there is one more o-ring that I
should replace. Which one is it and where might that be?

-- IV