If you can have the time open the drain plug and let it drain and drip over night. The valve body sits in the fluid and if you drain the fluid then immidiately remove the pan you'll end up with ATF dripping everywhere. It's a little cleaner opperation if you can let it drip for a while. Also make sure you meticulously clean out the allen bolts on the pan so the allen socket will go all the way into the bolt and help prevent stripping.

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