I have been reading some stuff about transmission flush for a 960. Whats the problem with doing it this way:

1. Drain transmission fluid from the pan.
2. Refill the amount that was drained
3. Run engine for some time shifting gears.
4. Drain fluid from pan again and refill
5. Run engine shifting gears

Keep repeating the above until you see clear fluid.

Am I missing something ? Will the above procedure drain the ATF completely or are there certain parts which wont be touched with the above procedure ?

THanks in advance for your responses.
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1993 960, 147K