I'm skeptical still. Unless your info was not 100 percent correct. You said that when using diff lock you could climb the hill in reverse but forward still wouldn't pull and just chattered a lot. If it were that axle it wouldn't make a difference forward or reverse it should have pulled up the hill both directions assuming you had the diff lock on in both directions. 
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(2) Original, 100, 102, 124, 73, 800, #1 and #2 cart, brinly plows, disk, IH184, IH244, 1948 F Cub
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