Eaton truetrac seems to be the weapon of choice right now. Tough to find something that works as well as this. This is what I run in my restomod. It's smooth like butter. You don't feel it engage and disengage like a locker. I haven't owned a locker but I hear they can unsettle the car when they lock/unlock. The truetracs are very reliable, take a ton of power and the transition from full lock to open diff is unnoticable.