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sounds like u have a toyota....
the upshifts are called 'flares' and the downshifts are simple an open clutch...since you have felt it long enuf to post, the plates are most likely gone and no additive will replace material.
it could be a sliver of stuff got into a clutch pack seal - no additive will fix that. could be clutch material and or bakelite has gummed up any shift valves....but only a teardown/cleaning will fix that.
what you can try to do is manually shift it, if that helps then I would suspect line pressures not rising from the throttle valve.
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