Reverse gear whine?

I believe the reverse gears are straight cut versus a helical cut typically used on the forward gears. Straight cut gears are simpler/cheaper to produce, but louder. Not a problem since reverse is used less frequently, and at low speed.
Yup, that's exactly it.
 
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Mine does the same thing, even my 02 rsx type s did the same thing in reverse. Must be a Honda thing.
 
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