Ours seems to drive pretty stable on the highway, partly because the added weight of the conversion is down low(the transfer case and front drive shaft). I'm sure it wouldn't win a race in a slalom course though. We drive ours conservatively, especially on two lane mountain highways. Obviously this change is best suited for those of us that love getting off the main highways and into those out of the way boondocking spots on Forest Service or BLM land. (Although we plan to use the 4wd in the winter to do some overnight rv parking at one of our local ski areas that we like.)