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Hi.
First, you didn't specify the year of your car. Up to and including 1983, you need type F fluid. Only for 1984 and onward should you use Dexron.
Second, are you sure you have the right amount of fluid. Usually, you shouldn't use the 90 deg scale because the fluid rarely gets that hot (if you use an IR thermometer on the underside of the transmission, you can get a good reading of the temperature, and you'll be surprised at how much cooler your fluid is). I find that interpolating between the two scales is more accurate, after the car has warmed up after about a half hour of driving.
There's not much else you can do, there are no external adjustments of bands or anything else that older domestic transmissions use to have decades ago. Also, according to your description, this is not a matter of adjusting the kick-down cable. And dropping the pan to clean the strainer (not a filter, btw) is usually a huge waste of effort -- although, if your transmission has a simple drain plug (some do, some don't), you can drain the small amount of fluid in the sump to see if any little chunks of debris are visible. You can do another flush, of course, and hope for the best. Given your description of how dirty the fluid was initially, maybe some irrecoverable damage has occurred, but you can still hope that a third flush will do the trick.
Good luck.
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