Sounds like you lost your shift linkcage bushing on the transmisson...
It ALWAYS falls off, there is nothing holding it on at all. Its a little white bushing that clips into the shift rod from the shifter, and fits in the link on the transmisson. Good luck trying to get one from the dealer unless you go there in person, most of the parts guys are retards... but its like $.17 so big woop.
Or if your lucky you can find it at the junkyard if the engine and tranny arnt pulled.
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