what kind of differential do I have? I have a 2000 chevy silverado 1500 5.3L v8?

[dmou]

alright, I have a 2000 Chevrolet Silverado 1500 4 door extended cab LS with a 5.3L V8. what kind of differential do I have?
or a better question would be, what kind of differential do they come standard with.. locking, limited slip.. what?
thanks