yeah it isn't on enough to start the nut, I really don't wanna get the gearbox lose again... like to never got it on cause of the headers...but if I have to do that to get it on I guess I have no choice haah.
once you are positive the splines are correct and the keyway is lined up (if it has one) you can take a 15/16 or 1" socket, and a BFH and tap it on until you can get the nut started.