COPO 9511

[Nova Research Project]

Hello,

I did find evidence of what the Axle Code would display on Chevy documents.

Not a Nova but... Here is an example from ssl78396 back in '09 posted to this site.

1968 H05 3.73 Ratio



Just need a bunch more to see the others.

Greg

[bergy]

Hey folks - this might not be a consideration, but the copo designation was required for non-standard drive train items because central office had to certify that the requested combination passed government emissions certification. I recall that it was a real pain (and time consuming) to get different combinations to pass certification - thus many odd (very low projected demand) combinations were dealer installed. I'm not saying that is what happened here - just trying to add to the discussion.

[WILMASBOYL78]

Just curious..was the COPO 9511 used to get the 4.10 gears in the 70 Yenko Deuce cars..??

Now...one of our upstate neighbors is the original owner of a 1969 L78 Camaro....TH400..4.10 gears...I will see if he has any paperwork that might help with this discussion.

Interesting discussion...

wilma

[Nova Research Project]

Hey bergy,

I am with you there. The RPO Codes were only the offered items. However the 1969 Nova Specifications did include the 3.73, 4.10, 4.56, and the 4.88. I expect they were submitted with the AMA Specifications. They were just not shown on the October 15, 1968 version of the AMA as the L78 was not listed. I do not know if the government emissions certification would have been completed accordingly.

The copy of the GM Archives 1969 Nova Model Specs may not be the final versions. But they do offer a few clues. But only a few as there is limited coverage of the 396.

This did have a copy of the Power Team Charts. But that chart did not go past a L48 with 3.55 ratio.

This also had one copy of the Vehicle Price Schedule which did include the L78. It lists the Standard Ratio for all L78 transmissions as 3.55. Nothing higher than that is on the this copy of the chart. So how would you know to write in the others?

Greg

[Nova Research Project]

Hello,

Speaking of 1970. There was a Scunico Chevrolet Fathom Blue / black interior L78/M21 Nova on Ebay back in October 2009. It had a very fuzzy shipper copy listing what look like 4.10. The shipper was dated 4/13/1970. Anyone know of this Nova? Or have a copy of the shipper?

Greg

[PeteLeathersac]

Being the instigator of this Copo 9511 mission w/ my postings of the previous thread, I thought I'd better weigh in w/ what I understand..
Any and all Copo 9511 info is great to learn but specifically the situation for 1969 is most interesting, especially w/ respect to X-body Novas!.

Keep in mind that rear axle gear options were available for 1969 production a few different ways including dealer installation, other Copo options that included it w/ their package also the Copo 9511 option we're now discussing..

Being a Copo 9511 rear axle is a true performance Copo option, this is an important fact and waaaay different than an appearance option supplied by a Copo # or other special order method..

* Again I believe the Copo 9511 option for 1969 model production was available for <span style="text-decoration: underline">4:56 or 4:88 only</span> so higher than, <span style="text-decoration: underline">NOT including 4:10</span>..


<span style="text-decoration: underline">Copo 9511 Rear Axle/1969 Chevrolet model year production:</span>

- Copo 9511 was necessary to get <span style="text-decoration: underline">factory installed rear axles
beyond 4:10 </span> in a 1969 model year Chevrolet..

- This applied to A-Body, F&amp;X Body cars also Corvettes too!.
(Different situation in years other than 1969 also unknown what
was req'd w/ other GM brand A-Body cars etc for '69?)

- 1969 A/F/X-Body cars &amp; 'Vettes were built/delivered w/ the Copo
9511 rear axle option..

- Documents for Copo 9511 '69 Camaros shipped exist including a
Z28 also a Copo 9561 L72 car, hopefully more!.

- The Copo 9560 or 9561 Camaro w/ 9511 would be a Double Copo
without having 9737..

- A Copo 9560 or 9561 car w/ 9511 and 9737 could be a 'Triple Copo'..

- Since at least one Z28 Copo 9511 was produced, if any non
9560/9561 cars were built w/ 9511 &amp; 9737 they'd be a
Double Copo too!.

- If Copo 9511 included components other than the rear axle supplied is unknown but questionable considering the option $ amount?. (rad etc)

- Other Copo # 1969 model A and F-body cars also 'Vettes were produced although a '69 Nova w/ Copo 9511 may be the only '69 F-body Copos built but regardless is <span style="text-decoration: underline">a real '69 Copo Nova</span>!!!


----------


An interesting document to review is the below ECL Sheet from CRG..
Note the references to Copo 9511 appears a few times..
Keep 'er going fellas and lets learn all we can!.

[img]<<GRAEMLIN_URL>>/beers.gif[/img]
~ Pete

[PeteLeathersac]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: PeteLeathersac</div><div class="ubbcode-body">
<span style="font-style: italic">- Other Copo # 1969 model A and F-body cars also 'Vettes were produced although a '69 Nova w/ Copo 9511 may be the only '69 <span style="font-weight: bold">F</span>-body Copos built but regardless is <span style="text-decoration: underline">a real '69 Copo Nova</span>!!!</span>
</div></div>

Fixing my own typo above,
I meant to say X-body here not F as in...a '69 Nova w/ Copo 9511 may be <span style="text-decoration: underline">the only '69 <span style="font-weight: bold">X</span>-body Copos built</span> but regardless is a real '69 Copo Nova!!!

So where'd everybody go on this topic anyway?.
Out searching for '69 9511 cars?.
Especially those real '69 COPO N[img]<<GRAEMLIN_URL>>/headbang.gif[/img]VAS!!!


[img]<<GRAEMLIN_URL>>/beers.gif[/img]
~ Pete

[67L78conv]

I am still working on it, for my part as I had PM'd Nova Research Project I am still digging through my GM paperwork. It just happens to be a much larger task than I anticipated but I am getting closer for sure. Hopefully my search of the documents will yield something useful to the discussion.

[Nova Research Project]

Hello,

I have hit bottom with most of my paperwork and manuals. I am still searching the pictures in my files. However my laptop died and will have to wait until I am back from the Nova Nationals.

Greg

[mockingbird812]

So, only a solid lifter Chevy could get a 9511?