type f is definitely not "snake oil"... firmed up my 3rd gear shift very good & kept the car on the road for many years as a broke teenager & into my mid 20's. that car saw more abuse than most on here & the trans kept up with it for longer than it should have.
i agree if its going bad a rebuild is ultimately needed, but for many transmissions depending on how bad the shifts are it can prolong the life for quite awhile to get you by until a rebuild can be done.
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