How often do you use the truck in 4x4? When was the last time you used 4x4? How do you switch from 2 to 4wd? Is it a knob on the dash? Or a floor shifter? If its a turn knob on the dash you most likely have vacuum leak(check hoses on transfer case servo motor for cracks or missing) or servo motor gone bad (the motor that moves the shift linkage). Check all your fuses, under dash and in the engine compartment, check the owners manual for fuses relating to the transfer case 4x4. If the 4x4 light comes on the dash when engaged and the front wheels dont engage, then your automatic locking hubs are blown. Blown hubs usually make a lot of clicking noise from the front wheels. If you have a manual floor shifter get under the truck locate the shift linkage and spray it down real good with some WD-40, while someone else trys moving the shifter. These manual shifters get rusty and stick if not used a lot (at least once a month). Also your shift knob on the dash could be shot or a wire on it fallen off. Hope this helps
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