Yup! You've come up against the "BITCH PIN"
Aptly named, as its a bitch to remove. Its a circle of metal that is pressed into place under a metal "C" shaped clamp that is snapped onto the linkage at the transmission. Remove the C shaped clamp (pull back the rubber boot, its under there) just yank it off.. Next, get a drift-punch (flat, not pointed) the size of the pin (not too big, not too small, if you dont have one, go buy one) put the punch up to the pin and hammer it out. (3-5lb hammer reccomended) This requires that you scream, curse, smash at least two fingers, and drive yourself to the edge of sanity.. then and only then will it release its satanic hold. Drive it all the way out and the linkage will fall off.