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07-08-2012, 12:54 AM
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60-66 Nut
  Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,252
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Re: 12 Bolt Question
You don't have to know the exact year to be able to get parts for it. All truck 12 bolt parts are interchangeable. Buying parts for a Chevy isn't like buying parts for a Ford, where you need to know the day of the week it was made
 The 5 lug bolt pattern started in '71. If you want to know the year, pull the cover and look at the date stamped on the ring gear. I can tell you though that the HA code is a 373 ratio open diff.There is a thread here somewhere with a bunch of differential codes in it.
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