ALL differentials wear- especially clutch type limited slips- and that makes 'noise'. You may need to have a knowlegable person drive your car, as long distance noise diagnosis is near-impossible. I'd hate to have you go thru this exercise, spend money and find out the noise you describe is simply a worn ring & pinion set or a mis-shimmed side gear. On the other hand if thats what it is, it's an opportunity to re-gear to 3.77 or other for cruising.
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