So I was trying to get up over a snow bank last night to get into my apartment complex, and I couldnt do it in 4hi, so naturally I went to put the kj in 4lo right? wrong. something happened and I have no idea what it was, but now she's stuck in 4hi and the shifter for 2hi-4hi-N-4lo moves freeley.

I mean totally freely, no resistance at all, and I can neither hear nor feel it doing anything that it is supposed to in the t-case. I thought maybe I could let the jeep sit overnight and then drive a little this morning and it might work again, but alas no. When I went to put her in 4lo I was rolling at like 2-3 mph and had the tranny in N, just like I am supposed to. so what went wrong?
Does anybody have any idea what either I did wrong or what happened. And how would I fix it? I just hope my t-case isnt completely shot.
Thanks.