2002 Dodge Dokota Transmission problem

Last year, July, replaced Trans.modulator…All went well. Now…sloppy shifting, occasion heavy thump changing gears when slowing. Trans. people
say All good according to their programs…but they also feel the same problems. Its an internal problem, they say, too expensive to tear down.
Drive it until it dies. ( 161 K on the odometer…otherwise is perfect. )
SO- I want to do a flush, then drop the pan, change the screens, tighten the bands and replace Trans. fluid. Anyone think this is a good idea???
Any-all help is appreciated.

How often has fluid been changed? There’s always debate on flushing an unmaintained transmission. As for everything else you plan, go for it.