i have a 2000 silverado with the z71 package, could anyone explain what kind of rear end it has and if its a limited slip or a locker and how it works exactly. when it engages its pretty harsh and it seems like sometimes i only have 1 wheel spinning but then it engages and i was just wondering if everyone elses engages rough 2. is it supposed to act like an open diff then lock when you need the extra taction?