Never understood why anyone offers a 4WD with an open rear diff... I've posted this before, but it bears repeating: How to tell if your truck has limited slip: - Find a dry parking lot - Put left foot on brake, mash pedal to the floor - Put right foot on the gas, mash pedal to the floor - Lift left foot completely off the brake, leaving gas to the floor - After 5 seconds, stop, get out of truck, and walk to the back. - If you see one stripe, you have an open differential - If you see two stripes, you have a limited-slip differential - If you see three stripes, put down the beer and give your keys to someone who's not drunk - If you don't see any stripes, check truck for Ford badge.