Did you know?5.3L 'Vortec' 5300 V8 with Active Fuel Management, 320 hp (239 kW).
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I think you're experiencing the same issue I have, at least it sounds like it based on your description like letting off the throttle. I have changed the rear axle bearings, u-joints, and redid the brakes. The noise is still there. In my case, it is either the differential carrier bearings, ring and pinion, or just the whole diff.
Yeah, I got a response or two over at performancetrucks.net asking the same question suggesting bearings in the diff. Will probably pay a mechanic to fix it as its a bit hard to do while using a walker to get around.
I would do it myself but I have never set te back lash on a gear set and do not feel like screwing anything up. I already set aside a grand for myself so when my rear does blow I will go to a Detroit locker. However, my mechanic who has been a Chevy tech for 15 years now(mostly trucks) said he wouldn't worry about the noise. If it gets worse, then start to collect the money, but otherwise it should be ok.