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11-12-2010, 10:06 PM
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1968-1970 12 Bolt Rear Axles Same Length?
Looking To Replace 2,76 Open 12 Bolt Rear Axle In 1970 Cutlass With A 12 Bolt 3.08 Posi From 1968 442 ...........will They Be Same Lenght ?
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11-12-2010, 10:12 PM
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If both rears are the Chevy 12-bolt, then yes they are the same. If one is the weird 12-bolt/10-bolt Olds hybrid rear I cannot say. If both are the odd Olds 12/10 combo they should be the same, rear width is the same for the '68-72 cars, it is the '64-67 rears that are narrower.
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11-12-2010, 10:53 PM
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The O axle was used in the Cutlass from '68 to '70, so both of these rear ends should be the O axle, and they will be the same width. The O axle has 12 bolts in the cover and 10 in the ring gear. The axles don't have c clips, they bolt in like the 9 inch Ford.
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11-13-2010, 01:22 PM
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If they are both A-body axles, yes the Chevy 12-bolt is a bolt-in. The only thing to watch out for is the driveshaft length. The Type O axle in there now has the pinion flange in a different location than the Chevy axle does. You will likely need a different driveshaft.
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