"Also, a mate of mine has recently got an SX3 and we were just having a discussion about the tightness of a diff. He says that holding lifting the car by the rear wheel and turning the other rear wheel in your hand should feel very tight (i.e. hard to turn) but my diff has never been that tight - infact, its quite easy to turn the rear wheels."
You need to be holding the spur gear as well as one of the wheels mate, then try turning the other one.
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