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[C2] Confusing differential code

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Old Jun 15, 2021 | 10:43 AM
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Default Confusing differential code

Hi all. I'm looking at a diff code of a 66. I only have a picture sent to me and can't copy here. BUT the first two letters are
A and then something that could be a S or O, since both are available for that year with S being standard and O posi for a 3.70 gear. I'm wondering if anyone has seen that or has a picture of a true AS or AO gm stamped differential.
Wish it would let me copy here. I asked people to look at it and get both responses. I have no access to the unit.
?????? Hope all are safe and cleared for a great summer.
Thanks
Frank
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Old Jun 15, 2021 | 02:43 PM
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i can get you one tonight of an AO
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Old Jun 15, 2021 | 03:10 PM
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Here's an "AS" from my '67. Stamp should look the same for a '66.

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Old Jun 15, 2021 | 05:05 PM
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my car



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Old Jun 15, 2021 | 06:41 PM
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Thanks all. It doesn't look like either one but definitely NOT S, so it must be a corroded O. Thanks again for all your help.
Frank
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Old Jun 15, 2021 | 09:47 PM
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Here is my oct 65 AO code
bob


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Old Jun 16, 2021 | 12:54 PM
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Thanks, it must be a corroded O code.
it resembles mostly what you have, definitely not S.
Thanks.
Frank
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