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Could be a few things. Check the harness that goes into the transfer case. I know it will sometimes get loose and not signal correctly. Also a possibility of a GEM module, father in laws 01 350 had a GEM crap out and he lost his 4x4. Check for power at 4x4 switch? Any codes tripping? If you can get a scanner you can watch the position of the transfer case during different positions (2,4,4L). Good chance that a code will be tripped but no CEL light.
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02 F350 CC LB 4x4 Lariat
Done: K&N CIA, Torklift Camper tie down system, Firestone Ride Rite Air Suspension(Dual guage control, w/ reservoir tank), Autometer 3 Pillar guage(Boost,EGT,Tranny Temp), Vision Type 81 19.5" w/ Goodyear G622 RSD 245/70r19.5 LRG, 03-07 power/heat/light mirror conversion, Sinister Coolant Filter kit.
ToDo: Powerslot Cryo rotors, Hawke SD pads, 6.0L Tranny Cooler, Oil Temp/Pressure, Fuel Pressure and Diff Temp guages.