I'm no fan of the forced draining of any auto transmission. There are many that say forced draining causes damage to the unit.
The rule of thumb is that about 1/3rd of all the transmission fluid comes out during a change. the rest being held inside. I did once on my truck, do a drain and refill, three times in quick succession but it made no noticeable change in the way the box operated. It was a waste of time.
So all I do now, is drain and refill at half the recommended intervals.
No transmission failures in over 600k of driving in last 20 years.
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