Shifting through the gears while draining through the cooler line helps.
HOWEVER you don't want to run without transmission fluid for long at all!!!!!
Changing the transmission fluid is SUPER important!!!
I also added a filter to the fluid cooler line going INTO the transmission.
I used a Magnefine brand filter.....often labeled "Raybestos"
THIS is the correct filter to use
https://www.amazon.com/Raybestos-515...+inline+filter
This filter has a big magnet inside to catch the fine metallic wear particles from the clutch plates, a pleated filter element and a pressure bypass in case the filter media becomes clogged.
Recommended change interval that I read was 15K miles.
I would change it at least once a year.
The correct transmission fluid is one that meets the Mercon V specification.
Carefully read the label on the fluid that you are buying to make sure that you get the correct fluid.
Mobil 1 maks one....
I have also used Redline D4 Transmission fluid.
Mobil 1 fluid that clearly states Mercon V
https://www.amazon.com/Mobil-Synthet...smission+fluid
Note that I have linked Amazon.....you may find it cheaper someplace else, I just wanted for you to see the product that I am talking about.