the fluid must never be over filled as most do.
if was that caused foam up of the ATF and bearings are destroyed.
- hot engine
- hood up.
- in park at normal idle speed, running.
- dipstick reads L >>>x<<<<H
the x must never be above or at high. hi is for when it over heats
the users guide tells what to do , do not guess. or BOOM
what you are doing is
100%wrong ,full stop .(adding ATF blind)
assumes adding blind, or wrongly.
yes lots of things possible
there are like 10 on cars tests.
all good shops know what to do.
not pulling means RPM cream high like neutral for Drive.
or stuck a lower gear. as in not upshifting
scan the TCM for errors is next.
if losing quart of ATF per day the car must not be driven
or wreck the box you will, or far far worse. make the core useless.
rebuilt tranny needs good core.
do if you feel tranny clutch packs slip do not make them slip more or they burn up.
stops pulling means what, false neutral or fails to up shift
a bad shift solenoid can that.