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Old 04-04-2020, 02:30 PM   #6
Mac VP
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Default Re: Wanted: Ford transmission expert

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The 21C items were some sort of experimental variation on those gears. The print specs referred to a different heat treatment (and perhaps a little different alloy - I can’t remember) than the regular Ford specs. They stopped listing those for sale a few years after the war. Regardless of a possible difference in the rear thrust washers, you can consider them interchangeable.
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