Rear axle and differential

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May 17, 2018 | 04:38 PM

bluecutlassconvertable

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Joined: Mar 2018

Posts: 14

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?

May 17, 2018 | 07:07 PM

oldcutlass

Administrator

Joined: Oct 2009

Posts: 42,513

From: Poteau, Ok

Welcome to the site. You won't like those gears either.

May 17, 2018 | 08:01 PM

rcorrigan5

Randy C.

Joined: Feb 2009

Posts: 3,348

From: Albany, OR

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.

Randy C.

May 19, 2018 | 05:05 AM

olds 307 and 403

Out of Line, Everytime😉

Joined: Dec 2006

Posts: 10,135

From: Melville, Saskatchewan

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 19, 2018 at 05:07 AM.