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if your going to be changing the gear ratio at all in the future, your better off going with the 9" because you wont have to do as much shimming and what not. If your just looking to replace the rearend, definently go with a 12 bolt. its just like the 10 bolt, but stronger, like marcar said it will bolt right in
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69' Cutlass 4 door. Built 455 inside, grandma's grocery getter outside. Best sleeper in disguise. 
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