There's a whine from the area my passenger seat every time I accelerate or change lanes quickly. 
Seriously though, gear whine from the diff is bad. It's either low gear oil, a worn pinion bearing, or misaligned gears. Any of those scenarios will result in catastrophic failure and you'll have a bad time. 
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2009 370z #206 (all mods are Home Depot)
2009 Ducati 848 (full Ohlins, Termignoni, etc)
2003 Grand Cherokee (long arms, big tires, 4.56, lockers)
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