I'm picking up my fist Blazer this weekend. Yeh. I was wondering if I could get some help in terminology. Since I'm going from the strip to the rocks for the first time. What exactly does a detroit locker do? I've heard the term to describe rearends but don't understand what it does. Does it work with a stock 10-bolt or do you need a 12-bolt posi? Thanks Be Gentle, Its my first time!