COPO 9511

[mockingbird812]

Let's get this hashed out. From what I gather we need an understanding of and documentation on:

1. what was COPO 9511 (what was included - what years was it available)
2. was this COPO process necessary to put a gear numerically higher than 4.10 in a Chevy in 1969.

* I linked from the previous thread on this subject here

[mockingbird812]

This was from Wilma's link:


<span style="font-style: italic"><span style="font-weight: bold">G80 1969 Camaro Positraction rear axle, when ordered without RPO Z28 or SS 396. $56.90 48,755
G80 1969 Camaro Positraction rear axle. $42.15 48,755
G84 1969 Camaro 4.10:1 Rear gear ratio. $2.15 8,018
G84 1969 Camaro COPO 9511 4.56:1 Rear gear ratio. $42.15 N/A
G84 1969 Camaro COPO 9511 4.88:1 Rear gear ratio. $42.15 N/A</span></span>


Last column above is for total ordered. Each of the &quot;COPO&quot; item above is linked to an RPO of G84....I'm confused [img]<<GRAEMLIN_URL>>/hmmm.gif[/img] !

[Nova Research Project]

Hey All,

Consistent repeatable facts are what will make (or break) this review.

Let's start here as this is where the order process began:

1. The 1969 Nova Order form. On the Back of one would be the Available RPO axle options.

2. The Salesman Order and Price Guide. Specifically the <span style="font-style: italic">Vehicle Price Schedule</span>. This is from the catalog not the pocket price guide. This document has the limitations associated with the RPOs. Including what axle ratio was available (or not) with certain engine / transmissions combinations. It also included the power team chart and the associated ordering procedures.

These prices guides were updated at least quarterly. As things may have changed, it would be good to reference as many versions as possible.

I do not have hard copies of these documents. I will look to see if I have digital copies. If any one else has them please post.

Greg

[Schonyenko2]

I have a copy of the ad for Kevin Suydamn's 69 Yenko Nova. It shows 4.10 rear. Does not state BE, or BV. Marlin, you explained the other day that the people who restored the car thought it was a COPO until they figured out that the info was not lined up correctly on the sheet. Any insight from that sheet to add to this discussion? It was my understanding that the 69 Yenko Novas were BV. If they started life as L78s are there docs on how they were ordered with rear codes?

I'd like to see docs on anything higher than 3.55. I've had an e mail stating 3.55 was all you could get in 69 without going through the 9511 process.

[Nova Research Project]

As review, here are the listed RPO Axle codes and the associated broadcast and order codes:

1969 Nova....<span style="text-decoration: underline">Broadcast Code</span>
RPO...Ratio..Standard..G80 (Posi)
G76...3.36...BC*.......BD*
G92...3.08...PA*.......PE*
G94...3.31...BM........BS
G96...3.55...BN+.......BT+
G97...2.73...BI*/BP*...BQ*/PX*
GT1...2.56...BA*/PB*..BB*/PC*
H01...3.07...BL#.......BR#
<span style="color: #FF0000">None..3.73...BO........BU
None..4.10..............BV
None..4.56..............BW
None..4.88..............BX
</span>* 10 Bolt
+ Standard for L78 Manual
# Standard for L78 Auto

This is from published Chevy documents. Which only means these would fit into a Nova not that you could actually order them. As the Camaro shared the same parts, it makes the research tricky.

<span style="font-weight: bold">So the question is, which of these were available in a 1969 Nova, and if so how was it ordered?</span>

1969 Nova....<span style="text-decoration: underline">Broadcast Code</span>
RPO...Ratio..Standard..G80 (Posi)
<span style="color: #FF0000">None..3.73...BO........BU
None..4.10..............BV
None..4.56..............BW
None..4.88..............BX
</span>
Greg

[Nova Research Project]

Hello Ken,

The original order form would have the non-standard axle ration written in on the Special Ratio line and the ZQ6 Performance Ratio box checked. Of course it would have to meet the rules in the Vehicle Price Schedule.

The non-standard axle ratio would be listed on the Window Sticker. Either under the order code listed above or possibly as ZQ6.

Axle code would not be listed on the Fisher Body sheet. However, the Engine code could be for L48, L34, and L78 in 1969. I believe that was the part that started the COPO thought (by it being on the wrong line due to a printer misalignment).

Another document that would show the axle code would be the GM Chassis Broadcast sheet. Line 6 Box 236. I have only ever seen one for 1969. While I have seen about a dozen for 1970.

And finally the POP would show the broadcast code.

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

[67L78conv]

The G84 refers to non standard gear ratios and was used for multiple gear options 4.10 through 4.88. If I remember right I took the info directly off of the copies of GMs official sales records I have from 1969 which covers all options and models and the COPO 9511 was part of the description next to that RPO which does seem a bit odd to me as well. I will try dig them out and see if there is anything else that may be of help to the topic in particular for Novas and double check for anything else. Will take a few days though.


<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mockingbird812</div><div class="ubbcode-body">This was from Wilma's link:


<span style="font-style: italic"><span style="font-weight: bold">G80 1969 Camaro Positraction rear axle, when ordered without RPO Z28 or SS 396. $56.90 48,755
G80 1969 Camaro Positraction rear axle. $42.15 48,755
G84 1969 Camaro 4.10:1 Rear gear ratio. $2.15 8,018
G84 1969 Camaro COPO 9511 4.56:1 Rear gear ratio. $42.15 N/A
G84 1969 Camaro COPO 9511 4.88:1 Rear gear ratio. $42.15 N/A</span></span>


Last column above is for total ordered. Each of the &quot;COPO&quot; item above is linked to an RPO of G84....I'm confused [img]<<GRAEMLIN_URL>>/hmmm.gif[/img] ! </div></div>

[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