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After using the link that someone provided below I decide to lookup what my replacement 8" trac loc rearend came from that I'll be swapping in this spring C2OW - 4025F. Looks like it was designed for a 62 Fairlane and was cast April 4th 64 (4D9 date). What does the W stand for though, is it for differential? It is not listed on the site and axle and driveshaft are listed as U. Anyone know off hand or have a more comprehensive site?

Decoding Ford casting part numbers

Thanks
 
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