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Message: <blockquote data-quote="98mustanggtkid" data-source="post: 603523" data-attributes="member: 9423">So I am getting a whine noise from the rear of the car I think that it is the differential because as I go faster it becomes more high pitched. So if i am going to rebuild it I might as well upgrade it so i dont have to do it later, but what all do I need? I would like to go with the 31 spline axles and upgrade the differential it self, I plan on getting a new differential cover as well but do I need to replace the ring and pinion as well? there is a 3:73 in there now but that was put in before I bought the car.Any help would be great ThanksChris</blockquote>