If you feel the open diffs aren't adequate, then try adding Shoo Goo to the differential, it works pretty good for limited slip without skidding much in a turn.
My KH 6x4 has the last axle locked, sometimes I peel the front tires with a load on. Freddy's red GL 6x4, I added Shoo Goo just to the last diff & it gets around as good as the KH.
