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Message: <blockquote data-quote="Petek" data-source="post: 628279" data-attributes="member: 9247">is the "whirring" sound always consistent with certain speeds?also it sounds like you need pads and rotors, and you probably have a vacuum leak, bad 02 censors, or a crappy iac. what does ur car smell like? rotten eggs, or horrible gas fumes? if your car is running that bad it is probably throwing up the check engine light, get it read and taken care of.you should really give your car a once over and inspect everything, or have it checked out, and probably give it a FULL tune up before you start driving it all the time. also diff fluid is easy to change, just make sure before you put the new diff cover gasket on that both mating surfaces are very clean. and be sure to put the correct diff fluid, and friction modifier in. while the cover is off, inspect for metal shavings. the whirring sound your experiencing could very well be just typical gear whine, which is not something to be afraid of, its annoying yes but nothing that will cause copious amounts of damage in your rear end.</blockquote>