so I had my Liberty in 4wd high last night for the first time. this is only the second 4wd vehicle i have owned. the first one was a 2000 GMC Jimmy, but once which was a electrical/vacuum operated system. so obviously, there was no "feel" to it. well, the jeep shifted into 4wd hi ok. but it felt like it was binding (driving in a straight line) in the sand/ gravel/ dirt road I was on. this morning i made certain that all 4 tires were an exact match, and they are. is this "normal"? what else could be causing this binding feeling? binding in a curve i know is normal. but i've not felt this going straight.