I would be looking into a post-war heavy Chev truck to see if there is a comparable sized ring and pinion that utilises bolts to retain the ring gear. You might even consider a whole take-out centre diff assembly.
Unfortunately, heavy Chev trucks were not common in post-war Aust, being outsold by International and Dodge as the most common medium/heavy trucks. However, with Eaton differentials being the most common components across all makes (even Ford), there might be something about.
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