So here's the deal I'm looking to put a lsd in my 1999 spec-s. From my resurch I believe it currently has a open diff system. So my question is will I have to change the whole diff housing or can I still just drop in the gear box and go?
you can just drop the diff center into the spec s. just unbolt the the gear ring from the diff center and bolt it to the new diff center drop it back in and away you go. I would keep the spec s diff as it is a 4.1 ratio. I put a spec s diff in my spec r but i swapped the centers so that i got rid of the open diff as they are ****.