MANY PEOPLE THINK THAT A LOCKED differential means a 50:50 torque split. Actually the opposite is often true. Here’s why. I’ll talk about a normal left to right differential, but the same applies to the fore-aft differential when you have 4WD.
The job of a diff is simple: to allow for the different speeds of different driven wheels. Drive around in a circle and the outside wheel goes further than the inside. It does it in the same time, so its speed must be higher. Same in a segment of a circle, aka a corner.
A differential’s job is to make this possible. Both driven wheels get the same torque at the road surface, but rotating at different speeds. That’s the normal state when grip is good.