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Welcome to JustAnswer!!! My name is*****'m a 19 Yr Jeep dealership technician and I will be helping you with your question today...
If you can jack up the rear end and run it up to 20-30mph you should be able to hear the sound.. I would highly suspect it's a ring and pinion bearings issue. If you hear the noise coming from the center chunk then it's time to tear it down and replace the bearings..
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