Quote:
Originally Posted by Apex_BRZ
I'm concerned that the damage has already been done. Is that the case? Or is it just whining because the oil has been broken down by heat and is too thin? I'll get it changed asap. 
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As long as you're not launching the car, you should be okay. All differentials whine to a certain degree. What you need to do is drain the differential, check for shavings or particles, clean that drain plug (guaranteed it has shavings), and refill your differential.
If it was a little dirty, I suggest you run a couple days on track or another 5k miles, then change the fluid again. That 2nd change will be pretty good for some time.