overdrive gear ATM - A340E A340F

It's going to take more than a bunch of YouTube video's to become as ase tech....let alone a master one.
? torque converter have any bit to do with this overdrive gears not shifting back to 3rd gear at low rpms with a small amount of throttle

Try and imagine a torque converter like your clutch in a manual, only it functions from hydraulic pressure.
this is what controls the downshift from D to 3?
or those solenoid things
if it has to do with ECU then that likely means it needs a special tool scanner programmer to adjust it?

so far i have not encountered this on the interWebs with someone else having this very issue with this type transmission engine combo