It's an old Eaton axle out of an 60-70's era Chevy/GM pickup that used the trailing arm style suspension.
They are generally known to be pretty stout and often come with 4.56 or 5.13 gears, and sometimes a Detroit. I've seen lots of guys running these in fullsize trucks with no issues. But as already mentioned it's getting pretty hard to find parts for.
Not quite sure what the "unless you have the matching front" comment means??? It should be a fairly common width and standard 8-lug pattern which matches just about any 8-lug front axle, not like it has a funky bolt pattern like some of the old military axles.
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