How overfilled before problems on 727 and how best to drain a bit?

[dvw]

Remove the cooler line that comes from the forward location at the trans. Place a container and let it set. It'll drain a pint just setting without running the engine.
Doug

 

[WileERobby]

Leave. It. Alone. Period.

 

[1 Wild R/T]

Either the cooler line or.... Remove the neutral safety switch....

 

[4406bbl]

Cooler line is the way to go if you must, no worries as that pressure is lower than line pressure, and is a fantastic way to change your fluid.

 

[Some Car Guy]

Thanks guys