it needs to be in neutral when switching from low..........................
tell me,what does the indecator lights on the switch do when tring to shift?
do you hear a clicking?
tell me all you can
thiis is a weak transfer case motor/actuator......it will need to be replaced,this is located on the side of the transfer case
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you may need to left click the picture and click;,save picture as;then save them to your computer,then you can make them big as you want with your picture program..
be sure to install a good actuator,,it is very common to even get bad new ones,,,this need to be strong