no low range 4whl drv

To me it sounds like a issue in your transfer case, You lost the gears for "4wd high", This is a 26+ year old truck. I would only use the 2wd until you get it looked at and hopefully it wont break anything else. Hope this helps and best of luck.

Sorry I just got around to updating this issue. as it turned out, one of the front lock-out hubs was bad. I replaced it and the unit worked fine until I sold it a couple years later.