Hello to everybody. New here. I just bought a 2005 J70 in Saudi. I thought all J70 Land Cruisers had locking differentials but it seems I was wrong. Mine J70 does not have manual lever or electric switches on the dashboard to lock the differentials. As it is ... it is great on the sand dunes.... but it does get stuck if the dunes are steep. My question is : is it possible to add the locking diff function ? what do I need to add or change ? are the differentials the same and it is just a matter to add the locking mechanisms as add-on ? Are the rear differential open or limited slip ? Thanks in advance for any tips