I know it is by the way it skids in gravel and on the wet roads, If it was an open non-LSD then only the wheel with the least load would spin.
toyota uses a Torsen LSD which is a TORque SENsing LSD. They are a very good thing, as they always spread the torque evenly between both wheels at all times, so even if you have one tyre on ice and the other on tarmac, both wheels will spin evenly.
If you jack the car up and spin the wheels you wouldnt think it is a LSD if you are used to the old clutch type LSD which uses friction to lock the two wheels and would make it really tight to turn.
There are a couple of different ways of getting the LSD to work - There are the options of a '1 way, 1.5 way, or 2 way'. What this means is that with a '1 way', you only get the LSD action when under power. A '1.5 way' has a little LSD action when on trailing throttle. (good for controlling the car when cornering) And finally the '2 way', which is the drift driver's dream, as the car will want to slide everywhere. ;) Not the fastest way to get around a corner, but it looks pretty cool and *BLEEP*loads of fun.
Torsen type diff
friction clutch type diff
Hoon~~~
Now i know i need a 2 way LSD........
Thanks....