If you have had “issues” for 100,000 miles, I don’t think back flushing the screen is going to do more than get it to move a few miles more. Even with fluid changes, 100,000 miles is a very long time in the life of a transmission.
The 2001 were known for valve bodies that lost their ability to hold line pressure, leading to premature parts failure.
You can’t fix that by pouring stuff into the transmission. Running 100,000 miles with “issues”, likely from low line pressure, and the resultant poor shifting, and it’s very likely this is worn out.
What, exactly, do you think is plugging up that filter? There is only one possible source of debris in the transmission - the transmission itself. So, whether chunks of hard parts, or the frictions from soft parts, if the filter is plugged, the trans is done, not because of the filter but because of the source of enough debris to plug it.
If you’ve lost two gears, then it’s likely not a solenoid, or even a valve body. It’s rebuild time.
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