Cost of a complete transmission fluid change?

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What is a Transmission Flush? | Process and Advice

Some service centers use machines that add additional force to blast fluid and/or cleaning solution through the system. This is NEVER a good idea as this can damage seals and/or lodge sludge in places it shouldn’t be as mentioned above.

http://www.transmissionrepaircostguide.com/what-is-a-transmission-flush/