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When I want to do a full change I remove the return line from the cooler.
Do the filter change then remove the return line. Place a hose over it to a bucket. Fill auto and start engine.
Pump oil in whilst the dirty stuff is coming out.
As the oil out from the convertor is pumped to the cooler(because convertor is where most heat is generated) you basically get a convertor flush.
Many years ago on convertors without lock up if the auto was out I used to drill a hole in the convertor, drain the oil and do a few flushes with a solvent.
I would then weld up the hole.
Don't know whether this would be a good idea with a lock up type though, not knowing whether the solvent would have an adverse reaction on the lock up clutch plate.
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