[okgearhead]

No its not supposed turn, unless it is in four high/four low. Look at your front axle, right under the oil pan, you will see a plastic cover, it redirects oil when you take your oil filter off, remove this cover, it has three screws, behind it is a vacuum pod that pulls/pushes a lever to engage/disengage the front axle. It should be in the 5:00 posistion(disengaged) If its the 6:00 posistion, its engaged.