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06-06-2007, 11:33 PM
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#2 |
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60-66 Nut
  Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,246
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Re: 12 Bolt Question
No GM didn't make a 12 bolt truck diff in '57. The first year for the truck 12 bolt was '63 and they had pressed on backing plates and 10 spline axles. In '64 they went to bolt on backing plates, and in either '65 or '66 they went to 30 spline axles. Hope that helps.....
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