Looked again at the 4th picture, this time inside on the new IPad. Can barely see, but the heads on the fastener attaching the brake backing plate is T shaped, has the large rectangular head, that guide the backing plate onto the housing end.
Definitely the bolt-in axle version of the 73-77 8.5 A-body rearend.
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Buzzards gotta eat... same as worms.
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