Those Jatcos can be tweaked to suit. A lot of guys are running them behind rotaries now as the early RX-7s came with basically the same Jatco as Datsuns. I don't really know anything about what can be done, how much etc, as it is not something that interests me, but if you are keen I can try and find out from people who do.
_________________green200b - aka Alistair
'80 200B GX - the green200b
'81 RX-7 - 12A extend port, 4.11 Torsen LSD - daily
'74 RX-2 - 13B bridgeport, 4.44 LSD - cruiser
'82 Hilux - 350 Chev, 4.3 Detroit Locker, 33s - 4WD
Green200B has forgotten more about 200Bs than we will ever know.