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The Bonneville rear should work or the Olds 12 bolt from the big cars. I believe they are the same size. It is easier to swap the complete rear than it is to swap a ring and pinion and posi if you arent familiar with doing so. I dont believe there are any aftermarket/speed shop posi units or gears for the full size rears. Stuff can be bought for the Chevy Chevelle, 442,GTO rears. They are not the same as the full size cars. Look in junkyards, parts cars, and Ebay....you will find what you need.
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