Thread: AT drain and refill...percentages?
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Old 02-13-2010, 05:42 PM   #3 (permalink)
kannibul
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Originally Posted by fullmonty View Post
I had an answer in my head for you then I saw all the numbers and I lost it. Since you have 25% new fluid in there and you drain some more out, the amount of new ATF will be relitive to the amount of ATF you just drained. So I guess what I'm trying to say is if you had 10% New ATF and 90% old ATF and you drained half of it, you would have 5% New ATF and 45% Old ATF. I don't think I answered your question though. Why didn't you just drain it all and refill at the same time?
You can't. The pan only holds 3 quarts, just as most automatic transmissions.

The only way to get it all out, is to flush it, which is a bad thing with newer transmissions as it forces fluid through the transmission in ways it's not supposed to flow.
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