Originally posted by "dan"
the rotation thing doesnt always work either tho.
some owners can turn them in different directions even when there is lsd. its is viscous if that has anything to do with it.
super hicas u can tell by seeing if there are "power steering" lines leading to the back wheels. super hicas is just hi capacity 4 wheel steering.
The viscous LSD can be rotated in opposite directions by hand, but you can feel the resistance. If the viscous coupler is so shot that you can't tell, then its best to leave those at the scrap yard unless you are looking for a fixer upper.