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What can fail here that I have seen several times before is the transfer case shift actuator.It has an internal sensor that fails.This sensor sends a signal to the computer to let it know what the transfer case has been shifted into.Even though it has been shifted into 4wd high the sensor is most likely sending a false signal telling the computer it is in 4 low when it actually isnt.This causes the computer to keep the transmission from upshifting past 2nd gear like this.
I would have the fault codes checked with a scan tool that can plug into your model and read all computers in your model.Once this has been done any codes set need diagnosed to locate and repair this issue here.Some cheaper scan tools will not be able to read all computers so a scan tool that can do this will be needed.I suspect the actuator itself needs replaced.
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