I have had seal or gasket leak on my rear diff housing but not a carrier failure. My problem really does not fit any of your choices for the rear diff. But I do have the driveline clunk.

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Sly - everything but Onstar.
Mods - windrestrictor wind deflector, Clearbra 3M tape, splash guards, PCMforless.com custom dyno tune, Flowmaster 40 muffler.