New chattering noise

First off its the SDD3250-GK

Its always occasionally chattered when i let off the clutch but now its doing it pretty bad when im on the clutch?

Its only got around 20k on it for mileage, some towing never anything too big, all its seen for power is the smarty and its always been turned down for hauling. Never seen a sled or drag strip.

Im hoping its not wanting to grenade, any ideas?

Duals 9 times out of 10 are noisy. I've never had a quiet one.

Ya its always been noisy but never when i was on the clutch, that just started.

That's when they are the noisiest for me is when I depress the pedal.

Does it sound like a squel? Not a rattling noise.

No its a rattling sound