I finally found what I was looking for, and posted it on another thread, but thought I'd put it here also.
The Third Generation Grand Vitara does not use a viscous coupling
http://www.suzuki-forums.com/2g-2006-gr ... 4wd-2.htmlThe LSD in the GV is a purely mechanical unit, it does not have any clutches or viscous fluid to fail. It has only 2 side gears and a bunch of tapered wedges that slide back and forth between them. It's really cool, but hard to wrap your head around how it works until you actually see the insides of it..