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[C1] 60 differential

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Old Jun 4, 2024 | 04:40 PM
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Default 60 differential
My differential has a lot for wear in it so I'm looking for a replacement. Question is are all the 3rd members interchangeable up to 1962? Mine is not a posi. Thanks
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Old Jun 4, 2024 | 05:42 PM
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Originally Posted by Betty Floyd
My differential has a lot for wear in it so I'm looking for a replacement. Question is are all the 3rd members interchangeable up to 1962? Mine is not a posi. Thanks
ALLLLLLLLLLLLLLLLLLLL 56-62 Corvette and ALLLLLLLLLLLLLLLLLLLL 55-64 pass car rearend center sections are a 100%, total bolt-in swap.
BUUUUUUUUUUUUT, avoid the 55-56 rears because they are thinner, weaker than the 57-64 center sections.
It does NOT matter if it is a posi or a non-posi, they still interchange.
Here is an example of a side-by-side comparison of a posi and non-posi center section.







By the way, if the ring and pinion gears in your existing rear are OK and usable, your rear can be rebuilt.
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Old Jun 4, 2024 | 06:02 PM
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On the subject… and I know DZ has the answer…
What do we like for ‘64 posi lubricant?
John
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Old Jun 4, 2024 | 06:50 PM
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What was recommended and all I use is a quality 80-90 gear oil. I have never had any issues with that.
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Old Jun 4, 2024 | 06:59 PM
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Thank you DZ
No special LSD additive?
John
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Old Jun 4, 2024 | 07:18 PM
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Originally Posted by 61 Maroon
Thank you DZ
No special LSD additive?
John
Nope, ONLY if it is a posi rear.
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Old Jun 4, 2024 | 07:18 PM
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Yes. Mine is 1964 posi 3.55
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Old Jun 4, 2024 | 08:10 PM
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Originally Posted by 61 Maroon
Yes. Mine is 1964 posi 3.55
If it is a posi, then after the rear center section is installed in the axle housing, add one bottle of positraction additive, then fill it up with 80-90 gear oil. Other than that, nothing special.
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Old Jun 4, 2024 | 08:40 PM
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Thank you
This stuff ok ?

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Old Jun 4, 2024 | 10:04 PM
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I'm saving this for a special car....I have two quarts




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Old Jun 4, 2024 | 10:24 PM
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Originally Posted by jforb
I'm saving this for a special car....I have two quarts
Hey, I have 2 of those. Are they worth anything? And, I have one bottle of whale oil.
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Old Jun 4, 2024 | 11:02 PM
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I have several bottles of the whale oil...

I expect they're worth something, as art.



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Old Jun 5, 2024 | 07:15 AM
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Here's a list of parts for those centers

https://www.quickperformance.com/GM-...55P_c_581.html
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Old Jun 5, 2024 | 06:43 PM
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Your link is a great resource to all C-1 owners. Thanks for posting .
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Old Jun 5, 2024 | 06:47 PM
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It certainly is thank you
it’s interesting to note, like DZ said, the commonality of the 55-64 differential parts
John
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