Yes ,yes .But these  are known.Its my fault.I should be more specific in the first post.Sorry.

I m reffering to the case that we get a new truck and the tech specs as well as the salesman tells us that the truck has a Limited Slip Differential in lets say the Rear Axle.How can we check if this is true ?
Cause there are examples of salesmen that say what they think the truck has,without knowing it for sure.And the result is to get a truck with an LSD in the rear axle,only to verify later that its not true.It has happened to a friend of mine.
Mitsubishi Shogun Pinin 2.0-the factory specs and salesperson said that its has a VCU center locking diff and a helical LSD (that is Torsen type) in the rear axle.But when my friend rotated one of the rear wheels,the other turned at the opposite direction,excactly like an open diff.The thing is,is it an open diff or just the Torsen type LSD acts like that when we do this kind of checking ?
What are the ways to check this ?
Thats the reason  ,I mentioned the example of the truck with the rear axle airborn.If we have an open diff,when we try to rotate one wheel at one direction,the other wheel will rotate at the opposite direction.If we have a locker,they will both turn at the same direction.Even if we have a Friction type LSD ,we ll have the same result.(I ve checked it,cause in front I have an LSD 75%)
But I dont know if this experiment also applies in the Torsen LSD.Cause the Torsen (helical LSD) operates like an LSD as long as the wheels are on the ground.If one wheel gets airborn,they act as open diffs.
SO by which way can we check it ? (in the case for example we buy a new truck,and we dont know what kind of diffs it has)