So I tried to use my 4wd for the first time in several months a few days ago, and the lever just swings freely now; doesn't engage anything. I pulled a code for the 4wd switch circuit a bit ago, is this actually the issue? The display hasn't had the lights go on for years, but the 4wd was still engaging... concerned. Am I just looking at a new switch circuit or is something larger happening here?

Some very recent history:
I recently had a salvage transmission put in, with a GDE compatible torque converter, (97k) by a trustworthy mechanic and everything in that regard seems to be running great, unless this is a problem related to that install.
I just got the GDE eco & trans tunes done

Some older history:
Driveshaft was replaced 3 years ago (bottomed out real hard on some rocks, was making a terrible noise) but the 4wd worked fine after that was done.

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2005 Liberty CRD
Noob Guide Completed
Samco Hoses
GDE Trans and Eco tunes

I think that the cable connecting the lever to the transfer case came disconnected.
Or the monkey who installed your transmission forgot to connect it.

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U.S. Army Retired

Yeah my first stop would be the mechanic who installed your tranny. If it was working when you first got it back then the connector may have come loose or popped off or something of that nature. I would like to know what the outcome was though so please give us an update if it was resolved.

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07 4x4 Sport/42RLE/2.5" Daystar lift/245/75/16 BFG KO2s on 16x8.5 Chaos 5 wheels. Did not have to hammer pinch welds....yet

Don't speculate on it. Grab a piece of cardboard and have yourself a look see under your jeep.

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2004 KJ 3.7 Limited:
IRO WJ Upper Arm -- WJ Rear LCA's -- Rear Driveshaft Spacer -- JBA Upper A Arms -- 4 inch Lift -- 265/75/16 4" B/S -- WasherBottle Relocate -- Custom High Mount Intake -- Carpet Delete -- Homebrew Winch Bumper -- Warn VR8000 -- Homemade Plow -- Pinch Weld POUNDED -- POR 15 inner fenders --