If you have a howling noise coming from the back of your jeep but you can’t pinpoint it to the rear diff, any of the axle bearings, or the t case, try this simple test (YouTube link below). Often just spinning your rear tires and trying to pry them right/left won’t show you anything even if your bearing has failed. The geometry of a solid axle plus drum brakes makes it tough to use the standard tests on your rear axle/wheel bearings. This doesn’t apply to front wheels - REAR ONLY. https://youtu.be/LboQLLLrgwE