Howdy,
2006 CRV 5 Speed manual.

In neutral, cruising at 15 mph, and taking a corner I can hear the rear diff disengage as soon as the car straitens out. It coincidentially sounds like someone hit the door lock switch, but coming from the rear. Anyone that's spun down a heavy gear set will recognize this sound. Is it normal for the rear diff to be audible like this?

Trans and rear diff fluids were just changed 1k miles ago. Car runs fine

 

What dual pump fluid did you use in the rear differential? Honda OEM or something else? Did you check the rear stabilizer bushings?

 

Honda DPSF II. The rear stabilizer is an interesing idea. I'll go check

 

Rear stabilizer end links and bushings are intact.