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SOURCE: I am trying to change
This tranny has approximately 13 quarts of fluid. Just dropping the pan and replacing the filter will yield about 5 quarts or so, with the balance still sitting in the torque converter. I recommend just doing this instead of paying someone to power flush the system. There are debates whether or not this method will damage the tranny. When I did it, I got around 6-7 quarts out of it. Use GM's new transmission fluid Dextron VI. It's much better than the old stuff. GM starting putting the Dextron VI in 2009 and newer vehicles. Make sure you know what size your pan is, there is a shallow pan and a deep pan, the deep will have a step in it, the shallow will be completely flat.
There is another way to get rid of all the fluid, but it's very time consuming and difficult if you've never done one before. Involves disconnecting the transmission fluid cooler line at the radiator and having the pump inside the tranny pump out all the fluid for you.
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