I'm with those who say to drop the pan and drain the torque converter and not deal with a flush. I've done the cooler line flush method on a car that didn't have torque converter drain and it does go by quickly. But I'm of the mind that since you have to go under the car you may as well just let gravity do its work.

I feel the same way about oil changes, in that while I generally prefer to use vacuum method, for cars that require getting under to change the filter I drain the pan from the plug while I'm down there. On cars with oil filters that can be accessed from under the hood or wheel well I rather use the extractor.

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