With scanner do you get code 1 which means NO faults OR do you get no codes as you first stated...

IF no code appears then the problem is Hydraulic...again bleeding the transfer case & activating the solenoid for the differential & then bleeding it IS the correct starting point...of course the engine MUST be running to bleed that system & there are bleeder at both places.

Ask your tech if the transfer case was too full...that is the most common leakage point for that system...Fluid should NOT come out of the fill plug..but be level with that plug.

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