On a related note (well sort of), does anyone know how much these R200 3.9 LSD diffs were being sold for?

http://www.datsport.com/R200_diff.html

The open 3.54 is just not working out for me.

edit - found it, $650 - seem quite reasonable.

Is that a viscous LSD? It's also the finned cover so i think you need to do some modifications to fit it to a Z.

Probably work out cheaper to buy a R31 GTS LSD and install that instead.