Hmmm..mine like most everyone's is pretty loose too on the splines but doesn't make any noise..at least none I can hear. It does sometimes "Whip" in 4wd but a flick of the throttle centers it good enough to stop that.
OK so now you have me thinking that I should take a closer look, my rattle is in neutral or drive,
I am not sure if it is there in 4 wheel because I don't use it that often and when I do my concentration is focused on the terrain or the situation (problem

) I've got myself into and not a rattle, I'll run it tomorrow and see if I lose it in 4 wheel and maybe pull the center consol later this week and take another look.