are you pulling the transmission too?, if so then yes
if no then you will lose a bit of ATF when you pull the radiator because the auto trans cooler lines run to it, other then that no you dont need to drain the converter or transmission.... normally I would drain the converter at this point even if not pulling the trans but our 5.0L trucks have a converter drain so fluid change is possible with the engine in place
you have to remove the center console, but its not that difficult try search