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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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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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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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08-13-2005, 12:46 PM
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I got this code that was stamped on the passenger side axle tube
Quote:
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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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 Plant  etroit Gear and AxleNON-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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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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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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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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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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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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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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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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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.
__________________
I'm actually making progress on my 1988 Suburban TH-700R4 to SM-465 transmission swap, CLICK HERE TO CHECK IT OUT. CanAm Chevelle Club 700R4 Basics 700R4 Basics W/pics ______
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08-14-2005, 10:55 PM
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replies
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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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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