I have a 1992 explorer xlt 4x4 4.0 v-6 106k. I have a question about the front and rear axles. I have noticed some of the explorers do not have locking rear differentials like mine. Is this an ordered option when you purchase the vehicle? Mine cherps tires and is very hard to turn in 4 hi and low. I also want to know if the front axle is a solid posi when it is in 4 wheel. I have automatic locking hubs and when its engaged the steering wheel runs from me while in a turn. I would assume the front axle has a locker as well. I have to back up 10 feet when i disengage. I like this better than having to stomp around in the mud to lock the axles