Hey I have this noise just like your post. Did you figure out your cause? Was it normal? This is what you said. It corresponds with the exhaust or maybe bumps of the road
I have the same noise but I don't feel it is a problem. When I pull into my neighbour hood in 2nd and let off the throttle I hear a metallic whirring grrr-grrr-grrrr-grrr-grrrr sound, seemingly in time with the exhaust rumble. This isn't the gear whine (which I like too). It almost sounds as if metal is rubbing against metal. It doesn't sound destructive, just mildly noisy. As soon as you touch the gas slightly it goes away. I always assumed it was just the differential(s) or clutch.
I have the same noise but I don't feel it is a problem. When I pull into my neighbour hood in 2nd and let off the throttle I hear a metallic whirring grrr-grrr-grrrr-grrr-grrrr sound, seemingly in time with the exhaust rumble. This isn't the gear whine (which I like too). It almost sounds as if metal is rubbing against metal. It doesn't sound destructive, just mildly noisy. As soon as you touch the gas slightly it goes away. I always assumed it was just the differential(s) or clutch.