Hi Eric
Details I hold on #1851 are that it was a post 01/01/42 manufacture under Order No. MON.62 and manufactured by Ford, probably at their Homebush factory. The exact date should be stamped on the nomenclature plate or on the rear ledge above the diff. Can you forward the date if available. Details from the various manuals state that it had a 1938 rear axle with 5.83to1 diff ratio. Speedo non-interchangeable 18 tooth driven gear & 3 tooth driving gear.
Bob
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