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Rear axle and differential

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Old May 17th, 2018, 04:38 PM
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Rear axle and differential

Are the rear differentials the same for 1968 and 1968 cutlass? Type O
I have a 1969 open with 2:56 gears and may have access to a 1968 with 2:73 gears. Is it worth it or is this to small a difference?
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Old May 17th, 2018, 07:07 PM
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Welcome to the site. You won't like those gears either.
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Old May 17th, 2018, 08:01 PM
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The Type "O" differentials are the same for both years. You'll still get pretty good gas mileage with the 2.73 and it should be a little quicker (not much, but a little) than the 2.56.

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Old May 19th, 2018, 05:05 AM
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Type O would be 2.78, you run a few hundred more on the highway, leave it alone. I have those gears and added a TH350C to have similar cruising RPM to the 2.56 gears.

Last edited by olds 307 and 403; May 19th, 2018 at 05:07 AM.
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