When the torque convertor is not involved as you stated, 3 to 4 qt of fluid is all I can change for my 300D/SD. Since it is only 4 qt, I change the fluid (not filter/gasket) every 10K miles to make up for not changing the torque convertor fluid. I have a spare drain plug and many O-rings at home to prepare for the task each time.
David
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