Like 00t44e said, the axles aren't locked together. Pressure is applied to the clutch packs that limits how much they slip. Most limited slip systems increase pressure as more slip happens to a certain point. Typically somewhere around 50%. This is a simplistic explanation though. There is much more to it and more than what I can explain. Ronny Dahl did a video or two on the subject comparing open differentials, limited slip differentials, and locking differentials. Now, he is going at the subject from an off road driving perspective. So, for an only on road driver, the information is going to be a bit skewed but useful none the less. I'm sure there are other youtube channels that cover the subject as well.