It does not make sense to drain and fill. Draining only takes out half of the total volume of ATF in the trannie. You end up mixing old and new fluid. You would not do that with engine oil, why would you want to do that with your trannie?
You also don't have to have it flushed. I have posted the HOW TO do your own flush several times. If you just dump and fill you are only changing 7 out of the 18 quarts, not to bright if you ask me!!
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