V8 Transmission Fluid Drain and Fill Question

[derekdevasia]

Yes, I did a lot of searching, actually 2 hours worth and I can't seem to find the answer I'm looking for.

DIY: Full Flush for Automatic Transmission - Tacoma World Forums

I saw this thread on tacoma world using the transmission fluid line to the radiator to drain old fluid, I understand the concept, but in in the post, he said he started the engine and shifted through the gears even. Wouldn't that be bad for the transmission with 2-3 quarts draining each time? Running the transmission with a lack of fluid?

Also, If i was just to do the traditional drain, fill, drain, fill, drain, fill until happy method, after each time I fill it, should I take it for a drive to get all the fluid mixed in?

 

[4RUNNER_2004]

Follow factory temperature check method, you would be OK, you are safe drain fill several times.
don't worry, many people did this. I did it twice.

 

[46runner]

If drain and fill, you'd want to start it and run it through the gears in between each fill. Let me know if you decide to do the DIY flush on a 4th gen 4Runner. Or if you find a DIY post for doing it on a 4Runner.