Originally Posted by mickblock
That's normal and like Patrick said FWD is only meant to be used in slick conditions or loose earth. But it's the two front wheels that are locked together by the drive train when FWD is engaged. The wheel on the outside of the turn has further to travel and needs to rotate faster but its locked in step with the inside wheel. So the two wheels resist each other. Any cars rear wheels would do this too if there were no differential that allowed them to rotate at different speeds.
The front wheels are NOT locked together. The front has a differential just like the rear does. You are right about the front wheels traveling at different speeds though. The binding occurs in the transfer case which does not have a differential in it. When you are going in a straight line, all the wheels are going the same speed. When you turn, like 01_Ranger said, the front and rear tires are rotating at different speeds. The transfer case in our Rangers are not full-time, so they do not allow speed differentiating. However, there are some vehicles out there with full-time cases that allow speed differentiating and use on dry pavement.