which driveshaft splines? the ones in the U joint or the ones on the Final Drive? the pins? cant see how they would click? they are a pretty solid fit in their holes and the pins are chrome plated and have to be HARD . I took mine apart and they were dry dry dry with rust in the holes. never enough time to do it right the FIRST TIME.... but ALWAYS time to do IT AGAIN . when everything is done... there is ALWAYS ONE MORE THING TO DO.