Get under the truck, and spray the $hit out of the transfercase shift rod with PB Blaster. Let it set up and then get in there and really hammer on that shifter until you get it back into either 4WDhi or 2wd. Might help to run the truck so everything has a chance to warm up inside. I had a similar issue about it not wanting to shift. Turned out snow had gotten around the shifter under the truck and froze everything solid. might help to store it inside if you can do that. <img src="/forums/images/graemlins/kewl.gif" alt="" />

Richard E
1989 Montero - Stock-ish
1989 V6 Auto Raider - 5.3 Vortech Swap.
1987 Mitsubishi Starion 2.6t, soon to be 3.5
1983 Honda XL600R