I got the borg warner diff back today, here is what was done to it.
one axle was resplined
it was shortened, two inches narrower than original (to suit the wheels I have, so I dont need flares)
all the mounting brackets were taken off the original unit and welded onto this one (trailing arms for the four link and coil bases)
All that was $1060, and they supplied the diff. I am going to use the skyline centre until it breaks and then probably go with an LSD, maybe.
Not that you 1200 guys will need to worry, but they also stuff the trailing arms in making the jig so make sure you get some more, but if you go to Aussie Diffs they have a sunny jig made up now, thanks to me.