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You have 2 options....find a rear with the posi and gear ratio you want. The factory unit in 66 is actually a Pontiac unit. Look for a big car Pontiac from 65 up to 70. In 67 Olds big cars used a 12 bolt year. You can also look to one of these cars to 1970 for the 12 bolt posi and change the whole rear assembly The other option is to find the posi unit and gear you want and have someone who knows what they are doing swap the thing into your rear.
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