What rear end is this?

I’m 90% sure I have a non dually 8 bolt 1 ton here, right? I am planning to swap in my 2wd 1987 Chevy s-10 rear 5 bolt and a 4 link.
Anyone know this rear end?
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8EB3A502-B556-4ADE-A0DE-7964A5BEF004.jpeg (226.09 KB, 101 downloads)
D1648255-45CB-4019-BEE7-8BD036B2C203.jpeg (195.26 KB, 100 downloads)