DO NOT HAVE IT FLUSHED! Have a shop drain the trans and when you rotate the torque converter you will find the drain plug facing forward toward the engine. Auto transmissions have had filters for about 60 years. Some are fine mesh screen type, others are replaceable plastic or metal filters.

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81 300CD (sold) 1972 280 SEL 4.5 (sold) 1966 250 S 4 spd (sold) 1974 450 SL (sold) 86 BMW 325ES (sold), 1973 280C (sold) 1988 300 SE.