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The difference between the Paj and the trol is that the paj is constant all wheel drive, thus engine is always driving the front and back wheels, this is why you don't have hub locks on the paj. it is also why the paj has a center differential, to deal with differences in wheel speed between the front and back when you are driving on tarmac the paj uses a centre differential to split the drive, when you are 4x4ing though you want an equal 50/50 split of drive going front and rear which is why you can lock the centre diff on the paj. with the troll only when you engage 4h or 4l does the drive shaft to the front axle start to spin. to aid driving and reduce wear the troll has free wheeling hubs for when you are on the road, this means that the wheels can spin independently of the axle which is why when you engage 4 wheel drive you need to lock the hub to the axle via either auto hub locks (most GU trolls) or manual hub locks, which you said you have.
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