ok here we go since the misinformation is flying all over this thread.
First yes you have a J30 or a 240 diff if there is a ABS sensor on the snout. NA Z32 diffs did not have this.
Second off you have to be careful putting the output shafts in. You can actually not get them lined up and they will not seat properly. If you do this and force it you will mess up the splines and the shaft may not go in all the way. Even if it is the right shaft.
You do not need to mix and match 300zx and 240sx axles as well and I would not recommend that to anyone because the 300zx axles are longer, both of them! Period!
Jesusfreakdrifter if you do that your putting extra force on the seal which will cause it to leak.
That aside if you gently tap the shaft back out and make sure you have it on the right and the splines are ok. You can then line it up and tap it back in. Use a large rubber mallet for this.
If you can get the shaft another 1/8 of in inch you should be good to go. Its ok to have some the metal outer protection ring exposed as long as the shaft is seated a bit farther in than in your pic.
Now if you have pounded harshly on the shaft while trying to put it you probably have damaged the splines and that is why it will not slide in any farther.
I have seen this mistake first hand and I have seen a rear end guy file the spines to correct the damage. It can and does happen so be carefull.
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