GM Differential ID Please - Team Camaro Tech
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post #1 of 16 (permalink) Old Dec 10th, 12, 05:42 PM Thread Starter
Pat
 
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GM Differential ID Please

Hello Guys,
I purchased a 39 Chevy with a GM differential in it that I'm removing. The numbers cast into the rear housing are 3894860N. The numbers stamped into the axle housing are P1 0109G2. Can anybody ID this differential for me.

Thanks
Pat
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post #2 of 16 (permalink) Old Dec 10th, 12, 06:20 PM
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Re: GM Differential ID Please

From CRG...

http://www.camaros.org/drivetrain.shtml#axle

http://www.camaros.org/drivetrain.shtml#AxleCodes

It is a 67 or 68 Camaro 12 bolt, originally a 3.55 posi. What is the casting date?

Also, there should be an E under the PI 0109G2 stamped digits.

Is it PI or PL?

68 Camaro SS 396 - 468 BBC now, Air Gap Intake, 781 heads, M21, 12 bolt. / 67 Chevelle SS 396.
Looking for 68 Camaro with body number NOR 181016
CRG - www.camaros.org

Last edited by bcm66; Dec 10th, 12 at 06:51 PM.
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post #3 of 16 (permalink) Old Dec 11th, 12, 05:54 AM Thread Starter
Pat
 
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Re: GM Differential ID Please

Quote:
Originally Posted by bcm66 View Post
From CRG...

http://www.camaros.org/drivetrain.shtml#axle

http://www.camaros.org/drivetrain.shtml#AxleCodes

It is a 67 or 68 Camaro 12 bolt, originally a 3.55 posi. What is the casting date?

Also, there should be an E under the PI 0109G2 stamped digits.

Is it PI or PL?
It's PI. Where do I find the casting date?? Under the above numbers there is a stamp "E"

Thanks
Pat

OK---according to the table, the casting date is January ninth. I think??????

Last edited by trophyman; Dec 11th, 12 at 05:59 AM. Reason: Add E
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post #4 of 16 (permalink) Old Dec 11th, 12, 08:50 AM
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Re: GM Differential ID Please

0109 is January 9th but the assembly date of the unit.

Casting date will be on the center section, in the "webbing" area. Like this...from CRG...



or this


68 Camaro SS 396 - 468 BBC now, Air Gap Intake, 781 heads, M21, 12 bolt. / 67 Chevelle SS 396.
Looking for 68 Camaro with body number NOR 181016
CRG - www.camaros.org

Last edited by bcm66; Dec 11th, 12 at 12:29 PM.
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post #5 of 16 (permalink) Old Dec 13th, 12, 10:37 AM Thread Starter
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Re: GM Differential ID Please

OK--looks like L268 or L269 hard to see the last number
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post #6 of 16 (permalink) Old Dec 13th, 12, 11:37 AM
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Re: GM Differential ID Please

Can you post a picture or send it to me?

68 Camaro SS 396 - 468 BBC now, Air Gap Intake, 781 heads, M21, 12 bolt. / 67 Chevelle SS 396.
Looking for 68 Camaro with body number NOR 181016
CRG - www.camaros.org
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post #7 of 16 (permalink) Old Dec 13th, 12, 11:57 AM
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Re: GM Differential ID Please

More than likely it's L266, which would make it a 12 bolt out of a 67.

Ed
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post #8 of 16 (permalink) Old Dec 13th, 12, 01:58 PM Thread Starter
Pat
 
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Re: GM Differential ID Please

Quote:
Originally Posted by bertfam View Post
More than likely it's L266, which would make it a 12 bolt out of a 67.

Ed
Nope--definitely not L266 I'll walk over to the shop and take a picture and post it here.
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post #9 of 16 (permalink) Old Dec 13th, 12, 02:02 PM
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Re: GM Differential ID Please

On casting dates, often the 3, 8, 9 and sometimes 6 are hard to tell apart. But we will see.

Ed may be correct though, because L268 and L269 don't really fit for a 67 or 68 PI coded 12 bolt.

68 Camaro SS 396 - 468 BBC now, Air Gap Intake, 781 heads, M21, 12 bolt. / 67 Chevelle SS 396.
Looking for 68 Camaro with body number NOR 181016
CRG - www.camaros.org
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post #10 of 16 (permalink) Old Dec 13th, 12, 05:22 PM Thread Starter
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Re: GM Differential ID Please

OK--I stuck a small wire brush in my air grinder and cleaned it up a bit. Here is the pic.

Thanks
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post #11 of 16 (permalink) Old Dec 13th, 12, 05:35 PM
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Re: GM Differential ID Please

Pat, what is the chance of getting a picture of the PI 0109G2 stamped area?

I would say it looks like L 26 8 but it is still not easy to say for sure.

Ed, what do you think?

68 Camaro SS 396 - 468 BBC now, Air Gap Intake, 781 heads, M21, 12 bolt. / 67 Chevelle SS 396.
Looking for 68 Camaro with body number NOR 181016
CRG - www.camaros.org
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post #12 of 16 (permalink) Old Dec 13th, 12, 05:53 PM
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Re: GM Differential ID Please

I blew it up and turned it 180 degrees and it's really hard to say. It could be an 8 or a 9, but you're right, a higher resolution picture would be great if possible.

The problem is the PI code for 1969 was a 10 bolt, and the PI code wasn't even used in 1970, so if it really is 1968 or 1969, I would say it's probably a service replacement axle housing. A better picture would go a long way in determining the year, along with the dates of the ring and pinion if you can get those and again, a higher resolution picture of the date.

Ed

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post #13 of 16 (permalink) Old Dec 13th, 12, 09:17 PM
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Re: GM Differential ID Please

I am not positive, but I think the 3894860N casting number had been phased out before late December of 69.

68 Camaro SS 396 - 468 BBC now, Air Gap Intake, 781 heads, M21, 12 bolt. / 67 Chevelle SS 396.
Looking for 68 Camaro with body number NOR 181016
CRG - www.camaros.org
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post #14 of 16 (permalink) Old Dec 15th, 12, 04:21 PM Thread Starter
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Re: GM Differential ID Please

Sure--I'll take some pictures tomorrow, Sunday, and post them.

I'm using my Nikon D300 so the pics are very high res. Just need to make them smaller to post.

BTW, dont know if it means anything or not, as I said, the axel is in a 1939 Chevy chassis. The car was born, and spent all it's life, in Nevada. I'm sure that is where the differential was put in.
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post #15 of 16 (permalink) Old Dec 16th, 12, 07:09 PM
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Re: GM Differential ID Please

How deep are the spring perches? Assuming they are original, that would tell me a lot.

Kurt S.
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