Originally Posted by NFRs2000NYC
The only positive I have heard (through my limited understanding of diffs/axles as they pertain to offroading is that keeping your diffs open (especially on stock D30s and D44s) allows an extra margin of safety in terms of breaking something.
Open diffs give you lateral stability. Imagine you are driving across a slick hill (perpendicular to the grade). With lockers or LSD, both wheels on a given axle will spin, this tends to cause that axle to want to slide downhill (dynamic coefficient of friction). With an open diff, one wheel is generally moving at the same speed as the surface (static coefficient of friction) and this helps prevent you from sliding down the hill.
I read a scientific paper somewhere about a technology that disconnects the rear locker when it detects yaw exceeding a certain value, I can't remember for sure but I think it was Ford looking at adding that to their trucks.