Help identify C20 rear end

[Uglykato]

How is everyone? First post other than the welcome intro. So, the guy I bought this truck off told me the rear end will eventually need replaced; it makes a noise when you drive. It doesn’t affect the drivability, I’d just like to get it replaced. I did a fair amount of reading on the different rear ends in these trucks and am unsure what I have. I don’t want to pull the cover off just to count the gears and look for the stamp. Some people on here seemed savvy enough to identify it with the cover still on. I’d love to hear what you think it is.
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