I don't exactly remember which year was it. I think 99 then 00+ had hybrid LSD <img src="/forums/images/graemlins/kewl.gif" alt="" /> I believe it should be direct swap. But I stress the believe part I never 100% pursued this road since I don't have a need for one.

As far as oil t-case it uses GL4+ axle oil. It's been a long debate whether one can put GL5 in there. Personally I've been running Mobil 1 Synthetic GL5 fluid in there for last 6 years practically since I owned the 92. No issues so far what so ever.

92 SR, 285/75R16 Yoko MT ARB locker GAST compressor AirLift 1000 MM10500 Snorkel custom rear bumper
02 Montero LS died protecting the master
08 PowerWagon (stock!)