The 4x4 system is rear biased but upon slips allocates upto 45% (from memory) to the front. On the ARX it has a limited slip rear diff as standard. The ARX also has 2 syncro modes for starting on gravel or snow. This allocates some power to the front up to certain speed then it goes back to rear bias and power to front on slippage.
Have a look at the link, http://www.nissan.co.jp/STAGEA/M35/0110/, there are demonstrations of various functions including the 4WD function and the modes.
I insured through Just Car as Shannon's would not insure me without a garage in NSW.
Andy