85_Ranger4x4
Wallows in rivers
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On an open rear end, the e-brake won't necessarily lock both rear wheels, but I agree, it's odd that it was the inside rear wheel was locking up. You'd think that would be the one to slip the brakes with the additional weight on the other one. Possibly traction control, but if so, I don't think I want it to work that way. IMO, there was no real reason for that wheel to lock up in that situation.
Differential won't matter if both parking brakes are locked up.
It vastly improves the turning radius in a tight spot. I was using the differential brakes on my tractor all last night as I was using they rotary hoe which is kind of the same thing the Bronco was doing. Mash the inside brake, turn the wheel and around she comes.
Here is a guy playing with it on his squarebody Chevy, you can see how it changes the turning radius:
For a longer 4wd SUV it could be a gamechanger for turning radius on a tight trail.