What rear gears do I have??

[99_Sierra]

Alright guys my rear end started going out tonight on my way home. Have always wondered what gears I have in my rear end. So can somebody tell me where the code is that tells me what gears I've got. I have a 99 Sierra 1500 single cab z71 with a 5.3 it's a 10 bolt. There was a number on it that said 0747 if that helps anyone...

Thanks a lot guys, if you need anymore info let me know.
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