What might cause jeep wrangler rear axle seal leak?

The most common cause of a Jeep Wrangler leaking rear axle seal is improper axle installation or removal. Also, the axle seal can wear out over time, which can cause it to leak. An axle seal leaks more during highway driving, so the oil drops on the driveway may not always be present. As more fluid is leaked out, the transmission fluid level drops and the transmission will start slipping.If not caught in time, the transmission may even get permanently damaged. A leaking axle seal of the rear differential or transfer unit might cause a gear oil (sulfur) smell coming from under the vehicle.