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Ford Tractors Discussion Forum
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SOS Serial Number Help

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texfordfan

02-22-2021 13:52:10




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spotted a SOS with the following SN. CWC 569 and 312259. Can anyone tell me more about that tranny? It's a different number than my 871 has.




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texfordfan

02-23-2021 04:53:21




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 Re: SOS Serial Number Help in reply to texfordfan, 02-22-2021 13:52:10  
This was a replacement tranny no doubt. I think the tractor was a 59 based on the engine casting number. There was no serial number stamped on the normal place which was a common occurrence with the replacements



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Sean in PA

02-23-2021 04:04:30




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 Re: SOS Serial Number Help in reply to texfordfan, 02-22-2021 13:52:10  
Neither of those is a serial number. 312259 is a raised casting number that has to do with the design of the casting. I believe that one is the first design that was released when the S-O-S transmissions first came out with the Over Running Clutch (ORC). They changed the design later to a Direct Drive Clutch (DDC) and the casting number changed at that point to something that started with C0NN I believe. Ford had a program to replace the early transmissions wit the later ones at no chage, and I think I read from someone else on here (but my aging memory may be incorrect on this) that some of the earlier transmissions were retrofitted with the DDC while they retained the original casting number as part of the replacement program.

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