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How many times to drain transmission pan?

Big T

Big T

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Changed transmission oil last week. I have a deeper aluminum pan with fins, drain plug and temp sender fitting. I dropped pan to change the filter. The ATF looked dirty. I know that you only get less than half the ATF doing this, so how many more times should I drain and top off with ATF to dilute this down: 1x? 2x?

I'm thinking that 1x gets me to 25% mix of old ATF, and 2x gets me to 12.5%. Is that correct?
 
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