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From my experience rebuilding my own diff, I'll try to chip in to the best I can. As far as I could tell on my diff, the diff gearing itself really only made noise under load (so accelerating or engine braking). So I doubt it's the ring/pinion gears. If it was the actual diff, I would think the noise would be more prominent around corners, is this the case? If it were a bearing, it would be more of a whirring noise, is that what you mean by "chuffing"?
If you are up for trying things, I'd replace the diff fluid and see if it changes the noise at all. Inspect the plug as well for shavings. A decent amount of shavings/sludge on the plug is fairly normal if you haven't changed the fluid yet.
Is it more prominent from any particular side? This may indicate axle or wheel bearing issue on that side.
Any mods to the car? Any adjustments to the clutch?
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