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I'm thinking of changing my diff ratio from 4.56 to a highway friendly 3.08. I have a 12 bolt. My question is; will I need a different carrier?
 

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1971 Chevrolet Chevelle Malibu
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Depends you may have a 3 series carrier now and running either a spacer or the thicker 4:56 ring gear.
 

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As you might be opening it up to see the carrier, here's the carrier (Eaton) numbers:
12 bolt ED32088 - 2series = 2.73:1 & down
12 bolt 30140PM1 - 3 series = 3.08:1 to 3.73:1
12 bolt EDB30174 - 4series = 3.90:1 & up
 

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