Did you know?A 'Vortec' 8.1L V8 produces 340 hp (253 kW), for the three-quarter-ton 2500 series.
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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.
Back on topic, have you looked at the front unit bearings?