1970 camaro 3.73 12 bolt

gthomas · #1 02-08-2014, 04:59 PM

I picked up a 12 bolt out of a 70 camaro (i believe). it has a 3.73 posi in it and the axle code appears to be c oz. Is this a z28 only rear, or available in any 70 camaro. Hope this isn't a dumb question, I am more of a mopar guy. Anyways, the story I got was that it was removed from a 70 z/28 30 years ago. Here is a pic of my 69 camaro I just sold. I love all musclecars. Can't figure out how to add images for some reason.... Figured it ou

**Dicky** · #2 02-08-2014, 06:32 PM

It's a '70 only, as that was the last year for 12 bolts in Camaros.

Dicky [img]<<GRAEMLIN_URL>>/flag.gif[/img]

jbsides · #3 02-08-2014, 06:38 PM

Yup, I found out the hard way back in the late 70's with a used one. Expensive lessone, even back then.

From the NastyZ/28 web site:

Rear Axle: GM 12 bolt (only year 12 bolt used). Positraction optional. 3.73:1 ratio standard. 4.10 ratio available (RPO ZQ9).

**70 Forest Green Zee** · #4 02-09-2014, 02:35 PM

70 Z28 only with 4 speed

**iluv69s** · #5 02-09-2014, 04:56 PM

I had a few 70 SS cars back in the day with original 12 bolts also....(not only Z-28's )

please correct me if I am wrong...

**iluv69s** · #6 02-09-2014, 04:57 PM

..and did a 70 TA use a 12 bolt also??

**70 Forest Green Zee** · #7 02-09-2014, 05:40 PM

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: iluv69s</div><div class="ubbcode-body">I had a few 70 SS cars back in the day with original 12 bolts also....(not only Z-28's )

please correct me if I am wrong... </div></div>

the COZ stamping is Z28 only with 4 speed. Other Camaros certainly had 12 bolt rear ends but not with a stamping of "COZ" that's all I'm saying

gthomas · #8 02-09-2014, 08:38 PM

Thanks for the help.

**L72Chevelle** · #9 02-09-2014, 10:58 PM

I have a COZ 12 bolt that I was told came out of a 70 formula firebird and had a friend that had an untouched 70 formula that also had a COZ 12 bolt in it from new.

**Lynn** · #10 02-10-2014, 01:19 PM

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 70 Forest Green Zee</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: iluv69s</div><div class="ubbcode-body">I had a few 70 SS cars back in the day with original 12 bolts also....(not only Z-28's )

please correct me if I am wrong... </div></div>

the COZ stamping is Z28 only with 4 speed. Other Camaros certainly had 12 bolt rear ends but not with a stamping of "COZ" that's all I'm saying </div></div>

I am not arguing, as I don't have the knowledge base to argue this. Just asking.

If I ordered an L78, surely the 3.73:1 posi was available, correct? Not standard, but available.
Why would it be stamped with a different code as opposed to the Z/28?