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Stock JK TechBulletin board forum regarding issues with OE (original equipment) components of the Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) such as factory suspension parts, engine, transmission, body parts, interior fixtures and the on-board computer.
My 2010 has 3100 miles still new. Just changed the oil. And checked everything the front diff fluid is clean the rear is black. So aparantly the rear will get dirty quick As far as the rattle get a bumper with a tire carrier and redo the bushings on the tailgate
Is your Jeep a RUBI. You said the diff fluid in the back axle is more dirty. On the Sport X models the back axle is a Dana 44 and front is a Dana 30. I was wondering if that had anything to do with the rear dif fluid being more dirty.