Another LSD thread... how to tell if LSD is VLSD without having it in the car

[omgRWDgoodness!]

All J30s were equipped with a VLSD so there is no cause for concern there, but if I remember correctly there's more to it than just swapping out the internals from the J30 to an open S-chassis pumpkin. I wanted to do this, but ended up finding a Z32 VLSD for cheap so I went down that route instead. You could also find an ABS/automatic-equipped 240SX driveshaft to compensate for the difference in length, or force that sucker in there and hope it fits.