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Most likely, what you are feeling is normal. In 4H (and 4L for that matter), the transfer case locks the front and rear drivehsafts together. When you turn, the front wheels travel a longer arc, so they want to spin faster. But, because the front and rear are locked at the t-case, they can't spin faster than the rear. So the hopping/skipping/binding you feel is the result. This is why 4H/4L should only be used when conditions are bad enough to allow the wheels to slip to account for the lack of differentiation. Best case scenario, the wheels hop and skip and it's just uncomfortable. It's not unheard of to break things under those conditions, though.
 
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