12 bolt decoding - Team Camaro Tech
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post #1 of 22 (permalink) Old Jan 25th, 20, 08:26 AM Thread Starter
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12 bolt decoding

I have a 12 bolt that Iím having trouble with decoding, the numbers are:

BP 5-19G

Iím pretty sure itís off of an early Nova but thatís as far as I got
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post #2 of 22 (permalink) Old Jan 25th, 20, 08:33 AM
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Re: 12 bolt decoding

I believe BP is a 2:73 open rear. 5-19G is May 19th and the G is Detroit Gear. Im going to guess its from a 68 or 69 Camaro or Nova. They made a BP that was a 3:08 for 67 Camaro also. You should be able to see the cast ing date on it so that will tell you which year it is.

69 Hugger Orange 396 M20 3:31
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post #3 of 22 (permalink) Old Jan 25th, 20, 10:01 AM
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Re: 12 bolt decoding

You've got something wrong in the numbers. BP is a 10 BOLT rear end. Post a clear high resolution picture of the stamp and the date code on the pumpkin and we should be able to figure it out for you.

Edit: After looking in my manuals, I DID find a 12 bolt BP code used on the 1965 Nova, 3.07 ratio, non-posi. If it really is a 65 Nova 12 bolt, tell me where you live and I'll come take it off your hands! And you won't even have to pay me anything to haul it away!!!

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Last edited by bertfam; Jan 25th, 20 at 10:11 AM.
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post #4 of 22 (permalink) Old Jan 25th, 20, 10:36 AM
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Re: 12 bolt decoding

Quote:
Originally Posted by bertfam View Post
You've got something wrong in the numbers. BP is a 10 BOLT rear end. Post a clear high resolution picture of the stamp and the date code on the pumpkin and we should be able to figure it out for you.

Edit: After looking in my manuals, I DID find a 12 bolt BP code used on the 1965 Nova, 3.07 ratio, non-posi. If it really is a 65 Nova 12 bolt, tell me where you live and I'll come take it off your hands! And you won't even have to pay me anything to haul it away!!!

Ed
Good catch on the 12 bolt! I had 10 bolt on the brain.

69 Hugger Orange 396 M20 3:31
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post #5 of 22 (permalink) Old Jan 25th, 20, 10:00 PM Thread Starter
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Re: 12 bolt decoding

I think this came out of a 66-67 Nova as it measures 57.75Ē (or close to that). Hey Iím planning on building this rear end with a limited slip or positive differential and 3.42 gears anyways. It still counts 12 bolts.
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post #6 of 22 (permalink) Old Jan 25th, 20, 10:02 PM Thread Starter
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Re: 12 bolt decoding

I think this came out of a 66-67 Nova as it measures 57.75Ē (or close to that) flange to flange. Hey Iím planning on building this rear end with a limited slip or positive differential and 3.42 gears anyways. It still counts 12 bolts.
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post #7 of 22 (permalink) Old Jan 26th, 20, 07:52 AM
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Re: 12 bolt decoding

Quote:
Originally Posted by Elwaupo View Post
I think this came out of a 66-67 Nova as it measures 57.75Ē (or close to that) flange to flange. Hey Iím planning on building this rear end with a limited slip or positive differential and 3.42 gears anyways. It still counts 12 bolts.

What is it going into? I do not believe that will bolt into a 1st gen camaro without re-welding it.



It might be worth more selling it to a nova guy and look for the correct rear end to buy; if the application is for a 1st gen camaro.
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post #8 of 22 (permalink) Old Jan 26th, 20, 08:24 AM
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Re: 12 bolt decoding

If that is a '66 Nova 12 bolt then it's worth more than a Camaro 12 bolt. It would be a huge shame to modify it because they are extremely rare.
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'69 RS/SS396 pro street/427/4spd/9"

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post #9 of 22 (permalink) Old Jan 26th, 20, 08:49 AM
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Re: 12 bolt decoding

Here's the Nova axle codes. Knock yourself out.

novaresource.org/axle.codes

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post #10 of 22 (permalink) Old Jan 26th, 20, 09:42 AM
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Re: 12 bolt decoding

Quote:
I think this came out of a 66-67 Nova as it measures 57.75Ē (or close to that).
Where did you measure this from? 57.75 is WAY too long to be from a Nova or a Camaro. That's almost full size passenger car width!

Measure from the backing plate to backing plate and let us know what that is.

Ed


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post #11 of 22 (permalink) Old Jan 26th, 20, 11:08 AM
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Re: 12 bolt decoding

57-3/4" flange to flange or outside drum to drum would be correct for early Nova.
OP recheck the stamping. It may be BR not BP. BP would be very rare for a 12 bolt.
Edit: I should have said axle face to axle face. Not flange to flange.

Al

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Last edited by allanjs; Jan 26th, 20 at 07:50 PM.
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post #12 of 22 (permalink) Old Jan 26th, 20, 12:12 PM Thread Starter
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Re: 12 bolt decoding

Quote:
Originally Posted by bertfam View Post
Where did you measure this from? 57.75 is WAY too long to be from a Nova or a Camaro. That's almost full size passenger car width!

Measure from the backing plate to backing plate and let us know what that is.

Ed
Youíre right I goofed on the measurements, itís 56Ē flange to flange and 59Ē hub to hub. Nova Source says the BP code indicates itís off of a 1968

Last edited by Elwaupo; Jan 26th, 20 at 12:24 PM. Reason: More information
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post #13 of 22 (permalink) Old Jan 26th, 20, 06:08 PM
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Re: 12 bolt decoding

68 or 69 Camaro or Nova (they used the same code), but again, BP for those two years is a 10 bolt, not a 12. Are you POSITIVE about the code? Post a picture and maybe we can tell more.

Ed
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post #14 of 22 (permalink) Old Jan 26th, 20, 09:49 PM Thread Starter
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Re: 12 bolt decoding

Iím positive that is the axle stamp, I also got a casting number 3852980N. The problem is I canít post anything, I just need to get these pictures to someone. I donít know how to use flicker
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post #15 of 22 (permalink) Old Jan 27th, 20, 07:00 AM
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Re: 12 bolt decoding

3852980 is the center section for a 65-70 full size car (and a 65 through early 1967 Nova) 12 bolt, but again, BP is a 10 bolt code. Either you have a Frankenstein where the axle tube(s) have been grafted from one car to another, or someone made a mistake when they stamped the axle.

You can send the pictures to me. My email address is in my signature below.

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