Daz, it will fit either front or rear. Only thing with putting it on the front is that it kind of makes steering 'awkward'. Fitting in the rear is more common, check YouTube for some information, makes a huge difference in traction.
you won't steer with it locked
i had lockers front n rear in me bobtail rr u can stear u just gotta think ahead
Brand new, in boxes to fit Discovery 300 tdi. Cost over £1000, will sell for £750.
Is this built into a diff and ready to fit ?
Afraid not, the actual locker needs to be fitted into your diff (someone correct me if I'm wrong, please). I'm told it's a relatively easy job to do?