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Old 09-13-2014, 12:48 AM   #1
mjs94080
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12 Bolt Differential Oil Change (66' Chevy C10)

I have a 1966 Chevy C10.

It has a 12 Bolt Differential.

*What oil do I use for the oil change of this 12 bolt Differential?

*Should I use Napa SAE90 Mineral Oil? ( I used SAE 90 in my transmission oil change).

*Also how can I tell if it is a Posi or Non-Posi?

*Do I use a GM non-slip additive?

*Do I use a sealer on the gasket?

I DO NOT KNOW ANYTHING ABOUT THIS. "PLEASE" ANSWER "ALL" QUESTIONS. Thank You!
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Old 09-13-2014, 01:15 AM   #2
VonDog
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Re: 12 Bolt Differential Oil Change (66' Chevy C10)

I used 80w90 in front and rear diffs and tranny on my 60 k20. Don't need additives and don't need seals. You can use the same oil for tranny and diffs and SAE 90 is fine.
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Old 09-13-2014, 12:01 PM   #3
66Submarine
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Re: 12 Bolt Differential Oil Change (66' Chevy C10)

If that is the NAPA GL-1 gear oil, no--you cannot use it. It is not a hypoid gear oil and lacks EP additives that the hypoid gears in the rear end need. Pick up some GL-4/5 rated 80W-90 for the rear end.
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Old 09-13-2014, 03:28 PM   #4
mjs94080
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Re: 12 Bolt Differential Oil Change (66' Chevy C10)

thank you!

I will get GL 4/5 rated 80w90 for my 12 bolt differential.
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Old 09-13-2014, 06:25 PM   #5
schpeen
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Re: 12 Bolt Differential Oil Change (66' Chevy C10)

when you step hard on the go faster pedal how many wheels spin?
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Old 09-13-2014, 07:58 PM   #6
mjs94080
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Re: 12 Bolt Differential Oil Change (66' Chevy C10)

well....when I punch the accelerator pedal I havnt done burn outs....
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Old 09-13-2014, 10:10 PM   #7
mjs94080
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Re: 12 Bolt Differential Oil Change (66' Chevy C10)

how about Royal Purple SAE90 ?


http://www.importimageracing.com/roy...universal.html

Last edited by mjs94080; 09-13-2014 at 10:11 PM. Reason: more info
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Old 09-14-2014, 02:42 AM   #8
Kenfuzed
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Re: 12 Bolt Differential Oil Change (66' Chevy C10)

I use this synthetic 80W-90 in all of the trucks (and cars) I've owned.
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