Rear Axle ID Help - which car used a 12-Bolt posi w/ trailing arms (PIC) - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-12-2005, 04:24 PM
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Rear Axle ID Help - which car used a 12-Bolt posi w/ trailing arms (PIC)

I am unsure if this came off a Firebird? Can anyone point me to the right direction what car this rear end came off from? Thanks...


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Old 08-12-2005, 04:40 PM
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Well if it did its 82 or newer. Brake drums dont like period correct to me but I dont know for sure.

The best way to find out is get the axle code from the rear end.

That will give you lots more info. Year, make, gear, etc.

Rich
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Old 08-12-2005, 08:27 PM
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Looks to me like it is a 67-72 GM A-body rear end.

Chevelle
Skylark
Cutlass
Lemans
GTO
Tempest
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Old 08-13-2005, 12:46 PM
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I got this code that was stamped on the passenger side axle tube

Quote:
Originally Posted by 406chevelle
Looks to me like it is a 67-72 GM A-body rear end.

Chevelle
Skylark
Cutlass
Lemans
GTO
Tempest

CCC 319 G

I can post a pic up later. There was also a "B" stamped on the top passenger side and an "A" on the top axle tube driver's side....
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Old 08-13-2005, 02:36 PM
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CCC 319 G

CC = 3.73 gear ratio
C = Chevrolet Buffalo
319 = 319th day of the year built
G = Assembly Plantetroit Gear and Axle

NON-POSI

As for the year, There is not enough information to tell.

You can send it out to me and I will tell if it fit in my 72 chevelle and how well it works for me...JK

If this rear end is in good working order, then it is worth hanging on to, worth some $$$ took me a year to find mine.
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Old 08-13-2005, 02:51 PM
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Look for a casting date on the carrier. That should narrow it done.

Rich
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Old 08-13-2005, 08:14 PM
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The upper arms are too long to be in the 70-72 chevelle. My guess would be an impala.
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Old 08-13-2005, 10:08 PM
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Upper Arms

Sorry, I should of stated that those arms were taken off an '80 Monte Carlo. I received the rear axle without the trailing arms so I took them off the Monte Carlo. Also, this is a posi rear axle. Both wheels turn when I spin one side - there is also a "lube limited slip" (or something like that) tag on one of the 12 - bolts.
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Old 08-13-2005, 10:44 PM
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POSI also cool

There should be a W, E, or O following CCC 319 G
, which would indicate:

W = Borg Warner posi
E = Eaton posi
O = Olds posi

that is why I said non-posi

Keep in mind if it is an Oldsmoble 12 bolt rear end, Oldsmoble installed 10 bolt gear sets inside of a lot of 12 bolt housings.
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Old 08-13-2005, 10:47 PM
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thanks

Ah, ok. I am going to post better pics I took of it in a minute. So, if I spun one side of the wheel and the other turns the same direction, would that make it a posi? Also, the LUBE tag on the 12-bolt - wouldn't that indicate limited slip / posi? Thanks...
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Old 08-13-2005, 11:13 PM
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here are some more pics...would there be more numbers on the pumpkin?




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Old 08-14-2005, 09:55 AM
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Look on the carrier. The cast part. There should be a casting date. Not always but most of the time. This will give us a closer idea of what it is from if we know the year.

Rich
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Old 08-14-2005, 06:55 PM
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You didn't provide the correct number previously, but the pic says it all.
CCC 3191 G is a 1971 and later Chevrolet axle code.

Ratio: CC=3.73 (This is a Chevrolet ratio code) other GM divisions may use it but not in the same year range as this axle codes out to)
Assembly Plant: C = Buffalo
Day of Year: 319 = November 15th (November 14 in leap years)
Plant Shift: 1 = Day shift
Positraction source (if equipped): G = Detroit G&A Positraction Carrier

From your pictures I can already say that you are dealing with an "A"-body rear, those cars are listed in a previous post in this thread.
I am also going to have to say without the casting numbers that you are only dealing with a 1971 or 1972 axle only.
I could also tell from the first pic that you were dealing with an "A"-body axle, and not a "B"-body, there would have been more room between the lower control arm/shock mount and the brake backing plate.
-------------------------------------------
I almost forgot, in a previous post there was question of if this was out of a Firebird, NO, not even close.
The Firebird had an option of the 12-bolt, in the first generation cars, which had leaf springs.
When the Firebird had an axle installed using coil springs, the 12-bolt was long gone from production in GM's cars.
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Old 08-14-2005, 10:55 PM
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Awesome, thanks for the information! I will look on the pumpkin and see if there is a casting number. Thanks again!
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Old 08-16-2005, 05:33 AM
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update - I will include pics later...

gear ratio is 2.73 (41 teeth on ring gear and 15 teeth on pinion). Both wheels turn together. There is a 15:41, 72, 8.75, etc stamped on the ring gear itself.


Assuming I use a 700R4, 350cui...would 2.73:1 be an ok choice to cruise on the highway? No burning rubber...
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