Most of the locking diffs now are automatic locking diffs based on differential wheel spin, like the G80. I can confirm that if you're using traction control, i

Most of the locking diffs now are automatic locking diffs based on differential wheel spin, like the G80. I can confirm that if you're using traction control, it seems impossible to cause enough slip to lock the diff. Then you can end up in a situation where you're on a icy/snowy hill and the car is applying the brakes due to excessive wheel spin before the diff will lock.