Beware, there is also a seal in the passing gear linkage of the valve body, i seen many shifter shaft seals get replaced and it would still leak from the same area, it will require the valve body removed and the c-clip removed from the throttle pressure shaft (passing gear shaft) and remove the thin washer and you will see the rubber seal in there, its easy to remove and replace and then you can get to the shifter shaft seal too, then you'll have a gauranteed leak free repair.