When shopping for a new axle shaft seal there are other parts of your Jeep that also may need to be inspected. The most common cause for axle shaft seal failure is improper installation or removal of the axle shaft itself. So if your Jeep repairs are DIY, be sure you're taking your time to properly calibrate the angles when replacing the axle shaft. Shafts seals do wear out over time, and 4WD carries a host of sturdy replacements. You can get a full Assault Seal Housing Kit from brands like Trail Gear or simply a replacement Axle Shaft Seal from brands including Crown Automotive.