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Message: <blockquote data-quote="GTStang98" data-source="post: 628274" data-attributes="member: 11955"><p>changing diff fluid is very easy. but the whirring from the rear end is a very scary thing. when i swapped my rear axles for 31 splines and went to a 31 spline differential the driveline shop guy was telling me about the different sounds that a bad rear end makes and whirring could possibly be that your ring and pinion gears are not within tolerance of eachother. do you have stock gears in the rear end? if your diff fluid is low, the whirring would be the sound of metal on metal because of a lack of lubrication.</p></blockquote><p></p>