Does the noise go away some when you take your foot off of the gas, then come back louder as you ease into the throttle?
If so, then it's the ring/pinnion howling, you'll need new gears properly setup to fix that.
If it's chattering when taking slow speed tight turns, then that's the clutch packs and you just need to add a little limited-slip additive to quiet it down.
I've had both issues... the howling arose after a fun evening at the drag strip... the pinion gear had shifted due to improper re-install by GM when it was getting fixed under warranty the first time.
EDIT: Are your gears stock oem? 6-speed or auto? Howling is more common w/ an aftermarket differential if not properly setup... but that'd rear it's head during break-in.
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