The Saker conversion uses a fairly simple kit of an inner/outer splined part that completely replaces the center diff - converting the box to FWD only. It also replaces the tailhousing with a flat plate, shortening the trans quite a bit. It's for the 5-speed AWD trans only though.
The biggest difficulty at this stage is getting CV/axle adapters made and brewing up your own shifter mechanism.
Seems like a nice way to go for a Suby powered car, you keep the stock clutch, no adapters, etc. There are also beefier gear sets available, up to full dog box setups, and LSD prices are cheap compared to Porsche trannys!
Jeff