The 70HD (used in GM c&c's, and dually pick ups) uses the same 4 bolt square flange as a 14 bolt. Iirc, your Dodge axle has a large round flange which is not similar to any axle GM used.
I hate to be repetitive but the same holds true for axle shaft flanges - 70HD and 14 bolt = same. *I think* the only conical washer set up used on GM trucks was in the early 1st gen D60 rear ends, never on the GM version 70HD.
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