You tried adjust linkage yet maybe its never been going into 2wd b4

Great thought. Front axle disconnected, t-case in 4H. Who would know?

Checked the fluid, topped her off as she was low. Double checked all the linkage. Now she's shifting like she's supposed to. Thanks for all the help/suggestions. I did however notice that the linkage is a little wore out, there's a little too much play in the bushings.

Good. Get new bushings, and thank freegdr for his excellent suggestion .

I can't help but be curious, how much fluid did it take, and was it only that that that gotr' to work?

It took almost a quart of dex III, so it was pretty low. I think if I remember correctly the capacity is 1.5 - 2 quarts? I did re-adjust the linkage at the same time, although it didn't look like it adjusted any farther from where I had it before, so who knows.

How's the levels in the other boxes, like diffs, trans etc?

Trans is spot on, I've been keeping an eye on that since I replaced it awhile back. Diffs on the other hand, no idea. That's something I've been meaning to check. After my last wheelin' trip I did notice a leak at the passenger side front axle at the knuckle, assuming it's an inner axle seal. I plan on replacing all my u-joints this weekend so that will give me an excuse to crack open the front and rear diffs to check them out, replace parts as necessary.

The stuff you're ignoring, and takes minutes to check, can get ruined from neglect. The transfer case gave freegdr a hint or you'd still be fighting that I suspect. Maintain your Jeep.