1966 O-Type differential?

Old May 14th, 2019, 01:30 PM
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1966 O-Type differential?

Was the O-Type 12 bolt cover differential available for the 1966 Cutlass/442?
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Old May 14th, 2019, 04:19 PM
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Not to my knowledge, both the 10 bolt Pontiac style and the 12 bolt cover Olds rears were used in the 67 's
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Old May 14th, 2019, 04:46 PM
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The o-type was a late model year addition, available starting May of 1966
Joe posted about this awhile back
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Old May 14th, 2019, 05:50 PM
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Well, it's a replacement then as my cars build date is 01-A 66. Previous owner has passed away so I'll never know. Is there a source that details any more information on the differentials. It is I believe a limited slip 3.23. Thats all I know.
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Old May 14th, 2019, 08:32 PM
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Originally Posted by 35tac View Post
Well, it's a replacement then as my cars build date is 01-A 66. Previous owner has passed away so I'll never know. Is there a source that details any more information on the differentials. It is I believe a limited slip 3.23. Thats all I know.
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The 66 only 12 bolt O type has the flat spring mounts where the 67 and later use the raised mounts.
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Old May 15th, 2019, 04:29 AM
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Will this help in deterring which on this is.
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Old May 15th, 2019, 07:47 AM
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That looks like a 67 up mount. Does the spring use a plate with a bolt/nut to secure it or does it just sit there? Can't see enough of the mount to make sure. It also looks like it has a rubber insulator on it,it it does,that's wrong,it goes on top.
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Old May 15th, 2019, 08:21 AM
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I'll try to get a better look and picture.
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Old May 16th, 2019, 06:06 PM
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Mike, thanks for all of the help. Much appreciated.
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