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Old 05-02-2017, 11:49 PM   #3
Captainfab
60-66 Nut

 
Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,254
Re: Decoding Rear end?

In looking at this thread, WA is a 3.73 open diff from a shortbed in '63 or '64. And looking at the casting date, I would say it is a '64.

http://www.67-72chevytrucks.com/vboa...d.php?t=327764
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