The 70 rearend is a 1" wider if remember correctly. Olds does not make a 12 bolt they make a rearend with a 12 bolt cover that really is a considered a 10 bolt. My advise is to run from it. Parts are extremely expensive for it. I had one when I got my first chevelle that claimed it had a 12 bolt under the car. Find a chevy 12 bolt for your car.
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Ray
1970 SS Chevelle Van Nuys Built
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