12 bolt codes / casting numbers and rear axle ? help - Chevelle Tech
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post #1 of 15 (permalink) Old Jan 27th, 12, 7:00 PM Thread Starter
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OLIVER
 
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12 bolt codes / casting numbers and rear axle ? help

Hello guys, i crawled under the car , cleaned the housing found some codes , i need some help please to de-code-i did a search on the web but i can come up with nothing certain... so here are the numbers ;

looking from the back at the 12 bolt housing
(driver side) top left 12 on top and 67880 just below
(passenger side) bottom right corner 55 L 4 8 or B

the only thing I decoded is L 4 8 - could be december 4 th 1968 , correct ? 55 ?

i ve been tryng to find the rear axle codes in order to find out the gear ratio but this code should be on the other side of the rear shaft , so i guess i need to raise the car somehow to find those numbers

thanks for any help...

Oliver
Milano , ITALY


1969 396 SS monaco orange (72)
468 Vortecpro 585 HP
M20 4 speed - 4.10s
Prosystems 1000
ACES # 09607

BEST ET 11.62
BEST MPH 120.9
BEST 60 FT 1.64
4000 lbs street car

https://www.youtube.com/watch?v=HS1ynhb5QBg

https://www.youtube.com/watch?v=k_p-GQl4gpE
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post #2 of 15 (permalink) Old Jan 27th, 12, 7:15 PM
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Re: 12 bolt codes / casting numbers and rear axle ? help

http://chevellestuff.net/qd/generic_rear_axle_info.htm
http://chevellestuff.net/qd/all_axle_codes.htm

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post #3 of 15 (permalink) Old Jan 27th, 12, 7:25 PM Thread Starter
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OLIVER
 
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Re: 12 bolt codes / casting numbers and rear axle ? help

Hi , yes... This is where i was looking and i decoded - L 4 8

but the other numbers i have are not there or maybe i m not finding them .... nor the axle codes

Oliver
Milano , ITALY


1969 396 SS monaco orange (72)
468 Vortecpro 585 HP
M20 4 speed - 4.10s
Prosystems 1000
ACES # 09607

BEST ET 11.62
BEST MPH 120.9
BEST 60 FT 1.64
4000 lbs street car

https://www.youtube.com/watch?v=HS1ynhb5QBg

https://www.youtube.com/watch?v=k_p-GQl4gpE
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post #4 of 15 (permalink) Old Jan 27th, 12, 7:28 PM
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Re: 12 bolt codes / casting numbers and rear axle ? help

The housing code and location is in the first link and the axle codes are in the second link -posted by year.
Some of the numbers you posted are just foundry marking and don't mean anything to the end user.

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post #5 of 15 (permalink) Old Jan 27th, 12, 7:47 PM Thread Starter
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OLIVER
 
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Re: 12 bolt codes / casting numbers and rear axle ? help

Mike thanks , so those numbers are just foundry numbers... so in the following link there is the " codes location " but i scraped and cleaned i found nothing... could it be its on the other side ?

http://www.chevelles.com/years/69/69rearcodes.html

Oliver
Milano , ITALY


1969 396 SS monaco orange (72)
468 Vortecpro 585 HP
M20 4 speed - 4.10s
Prosystems 1000
ACES # 09607

BEST ET 11.62
BEST MPH 120.9
BEST 60 FT 1.64
4000 lbs street car

https://www.youtube.com/watch?v=HS1ynhb5QBg

https://www.youtube.com/watch?v=k_p-GQl4gpE
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post #6 of 15 (permalink) Old Jan 27th, 12, 8:05 PM
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Re: 12 bolt codes / casting numbers and rear axle ? help

Look on the front of the passenger side axle tube for the code about half way between the center section and the brake backing plate..
Didn't realize Dale was showing it on the back of the tube ,close to the center section.
I wouldn't trust the code to be what's inside a 43 year old rear ,I'd pull the cover and get the gear info.
The rear could probably use a lube change after 43 years

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post #7 of 15 (permalink) Old Jan 27th, 12, 8:17 PM
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Re: 12 bolt codes / casting numbers and rear axle ? help

Hi Oliver,
With a Foundry Date of December 4, 1968, your Casting Number should be 3917124.

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post #8 of 15 (permalink) Old Jan 27th, 12, 8:32 PM Thread Starter
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OLIVER
 
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Re: 12 bolt codes / casting numbers and rear axle ? help

I guess i have to take the car to the garage i think its impossible to crawl under to look at the front side of the shafts ... but anyway thanks for the help .. and let you know if i find anything... ciao

Oliver
Milano , ITALY


1969 396 SS monaco orange (72)
468 Vortecpro 585 HP
M20 4 speed - 4.10s
Prosystems 1000
ACES # 09607

BEST ET 11.62
BEST MPH 120.9
BEST 60 FT 1.64
4000 lbs street car

https://www.youtube.com/watch?v=HS1ynhb5QBg

https://www.youtube.com/watch?v=k_p-GQl4gpE
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post #9 of 15 (permalink) Old Jan 27th, 12, 11:53 PM
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Re: 12 bolt codes / casting numbers and rear axle ? help

Quote:
Originally Posted by Mike View Post
Look on the front of the passenger side axle tube for the code about half way between the center section and the brake backing plate..
Didn't realize Dale was showing it on the back of the tube ,close to the center section.
I wouldn't trust the code to be what's inside a 43 year old rear ,I'd pull the cover and get the gear info.
The rear could probably use a lube change after 43 years
X2!

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post #10 of 15 (permalink) Old Jan 28th, 12, 12:54 PM
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Re: 12 bolt codes / casting numbers and rear axle ? help

Quote:
Originally Posted by Mike View Post
Look on the front of the passenger side axle tube for the code about half way between the center section and the brake backing plate..
Didn't realize Dale was showing it on the back of the tube ,close to the center section.
I wouldn't trust the code to be what's inside a 43 year old rear ,I'd pull the cover and get the gear info.
The rear could probably use a lube change after 43 years
The link, http://www.chevelles.com/years/69/69rearcodes.html , is here on TC, not my website.

I do have a rear end from a 67 Chevelle showing the stamped location at http://chevellestuff.net/qd/generic_rear_axle_info.htm however.
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post #11 of 15 (permalink) Old Jan 28th, 12, 12:59 PM
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Re: 12 bolt codes / casting numbers and rear axle ? help

Sorry for the mis-direct Dale.

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post #12 of 15 (permalink) Old Jan 28th, 12, 1:09 PM
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Re: 12 bolt codes / casting numbers and rear axle ? help

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post #13 of 15 (permalink) Old Jan 28th, 12, 4:47 PM Thread Starter
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OLIVER
 
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Re: 12 bolt codes / casting numbers and rear axle ? help

Dale, sorry i m getting confused - where are the codes on back or on front side of the tube ? - passenger - left side- looking at the car from the back
I scrubbed really hard on the back but have not found any ...
Thank you for the help

Oliver
Milano , ITALY


1969 396 SS monaco orange (72)
468 Vortecpro 585 HP
M20 4 speed - 4.10s
Prosystems 1000
ACES # 09607

BEST ET 11.62
BEST MPH 120.9
BEST 60 FT 1.64
4000 lbs street car

https://www.youtube.com/watch?v=HS1ynhb5QBg

https://www.youtube.com/watch?v=k_p-GQl4gpE
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post #14 of 15 (permalink) Old Jan 28th, 12, 4:58 PM
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Re: 12 bolt codes / casting numbers and rear axle ? help

Quote:
Originally Posted by oliver69 View Post
Dale, sorry i m getting confused - where are the codes on back or on front side of the tube ? - passenger - left side- looking at the car from the back
I scrubbed really hard on the back but have not found any ...
Thank you for the help
{edit - added photo}

The STAMPED codes are suppose to be on the passenger side front of the axle housing. These are not gang stamped and they're often not real deep either. GM parts book says they should be 8"-10" inboard of the backing plate but GM (itself) often didn't stamp them so there's no real measurement to go by. As you can see from teh photo I have of the 67 on that page, the stamping is more towards the center section but that's just from that person, that day, at that plant.

Again, road grime and paint from someone wishing to spruce up the looks underneath can make it hard to find.

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post #15 of 15 (permalink) Old Jan 28th, 12, 5:03 PM Thread Starter
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Re: 12 bolt codes / casting numbers and rear axle ? help

Great Dale, all is clear now..I ll try to find them ...have nothing better to do in rainy sundays anyway... Thanks again ciao

Oliver
Milano , ITALY


1969 396 SS monaco orange (72)
468 Vortecpro 585 HP
M20 4 speed - 4.10s
Prosystems 1000
ACES # 09607

BEST ET 11.62
BEST MPH 120.9
BEST 60 FT 1.64
4000 lbs street car

https://www.youtube.com/watch?v=HS1ynhb5QBg

https://www.youtube.com/watch?v=k_p-GQl4gpE
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