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Ok. So I pulled diff cover off. Only about 1 pint of, nasty black oil came out. Cleaned up everything, put new oil in. Took a test drive, hit 60mph. No noise. Got lucky,it could have been worse. Thanks for the help.

Thanks for the quick response. I bought used, 3yrs ago. It's my wife's jeep. and haven't gone 4wheeling with it. Not sure what the previous owner did. She's been a very reliable, Mom's jeep. It has 150,000mi. I'll check the oil tomorrow. I hope thats all it is.

The rear diff started making loud whining noise, soon as get up to 40-45 mph. From 0-40 no noise. Is there some adjustment, or fix. Or do I need a new rear diff? Thanks in advance