OK, here is what I did. I got a J30 Differential changed out the ring gear with original, and put it in the original pumpkin fits perfect! But now, my J30 longer output shaft won't go all the way in. Is there an alignment problem? Do I have to align something??? The smaller one goes in without any problem. I hammered and step on the longer output shaft but it won't go in. But it comes out easy.

I appreciate any help.

 

odd...are you sure you have the sides correct? may have gotten them mixed up.

 

did you get it workerd out?
did you use the j30 case too?

 

So far I don't have any problem. But I need to put it in all the way through. Someday...

I used the ring gear from my 240sx and 240sx pumkin. The output shaft is J30 and lsd is J30.

 

the sides could be wrong like shift said.
or your circlip could be bent

i woulda used the whold J30 unit