Tiny update.
The stars aligned a couple of weeks ago and I could meet up with the guy not too far from where I live. It appears to have been torched out of a 1989 or 90 Z71 (Transfer case skid plate was a Z71 thing I believe).
Looks Slightly better in person than it did on FB Marketplace. Remanufactured in ancient times by the looks of it.
The fact that it's torched out is actually somewhat of a good sign. Most likely, Someone at some point thought this thing was worth saving enough to take it out before the truck itself was sent to its final resting place.
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