How are you actually shifting it? Four high can be shifted on the fly. Four low you have to stop, put the shifter in neutral or park and then it will shift into low.
In four high the transfer case just has a collar that shifts to lock the front drive shaft into gear, then the vacuum hubs engage. In four low there is a different gear set that engages.
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Monday, October 30th, 2017 AT 11:06 PM