a lot of poeple think that if it has a lsd that the wheels shound spin the same way in respet to the road, ie if you spin the near side counter clockwise then the of side should spin clockwise but the diff has a percentage of off lock allowing the car to turn the only true way I have found is to have the box off and look through the drive shaft slots to see the centre bar,if there is a bar then its a non lsd, if you can see straight through ith no bar then its a viscous lsd

hope this help mate