4 wheel drive at highway speeds

If it’s a true 4X4 with just a transfer case, it’s not a good idea nor safe to operate it in 4 wheel drive on dry pavement. The reason is there’s no center differential between the front and rear differentails. Just the transfer case. And the transfer case doesn’t allow the front and rear differentials to rotate at different rates while going around corners. This can result in severe wheel hop while cornering and/or damage to the tranfer case because of binding while cornering among other driveline components.

Tester