Dave's got you covered. Just wanted to make sure you understand that this has nothing to do with the tuning. It's a common mechanical failure. Personally, I unplugged the solenoid which feeds the electrically actuated hubs so I can use my truck in 2-lo. If I plan to use 4wd, I just make sure to manually engage the hubs.
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Bob-
2003 F250 Lariat 7.3PSD CC SB FX4
Kwik (6637) Filter, RE 2.5" leveling kit, F350 Rear Blocks, TC Lock, Fumoto, EBPV/Exhaust Brake,6.0 Tranny Cooler, AIH Delete, IssPro EV2 Gauges, PHP Phoenix stock, 25tow, 40tow, 65tow, 80dd, 100perf, In-tank mods, Muffler Delete, WW, FRx,HPx, JW Stage 1 Trans, Swamps HV/HF IDM
-Pulling a 38' Forest River Sierra 5th Wheel
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