COPO 9511

**mockingbird812** · #1 07-18-2011, 01:06 AM

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** · #2 07-18-2011, 01:28 AM

This was from Wilma's link:

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

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

Nova Research Project · #3 07-18-2011, 06:09 AM

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 Vehicle Price Schedule. 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 · #4 07-18-2011, 06:41 AM

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 · #5 07-18-2011, 07:26 AM

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.

Nova Research Project · #6 07-18-2011, 06:54 AM

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

1969 Nova....Broadcast Code
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#
None..3.73...BO........BU
None..4.10..............BV
None..4.56..............BW
None..4.88..............BX
* 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.

So the question is, which of these were available in a 1969 Nova, and if so how was it ordered?

1969 Nova....Broadcast Code
RPO...Ratio..Standard..G80 (Posi)
None..3.73...BO........BU
None..4.10..............BV
None..4.56..............BW
None..4.88..............BX

Greg

67L78conv · #7 07-18-2011, 08:59 PM

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:

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

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

Nova Research Project · #8 07-18-2011, 09:54 PM

More clues,

In 1968 (as of Jan 1868) the 3.73 for Nova has an RPO of H05. The 4.10, 4.56, 4.88 were listed but with a * to indicate they were only available in a Posi.

Again in 1968 the instructions in the dealer catalog stated there were three optional Ratios for Axles:

All for $2.15

Axles Rations: See Power Teams chart for availability
Economy AXL1
Performance AXL2
Special (If axle ratio other than Standard, Economy, or Performance is desired, refer to Power Teams chart for availability - then list ratio on order form in box under "Special Ratio&quot

While in 1969 the same section lists:

Axles Rations: See Power Teams chart for availability
Economy ZQ8
Performance ZQ9
Special ...

Again in 1968 the dealer catalog listed the 3.55 as standard on the L78. However in 1968, Chevy listed the 3.73 (H05) as the Performance option. In 1969 there was no performance option listed. In 1968 the Special options were 3.07, 4.10, 4.56, and 4.88. While in 1969 the only Special list was 3.07.

In Summary, the specifications list all rations in both years. From a customer or salesman point of view:

In 1968 you can easily see the options and then write them on the order form. I.e. normal process.

In 1969 you could not see the options, but you could write them in on the order form. Would this trigger the COPO process?

Greg

Nova Research Project · #9 07-18-2011, 10:14 PM

hey 67L78conv,

I hope you have better production data on the Nova.

I only show:

G96 (3.55)
1968 = 3,017
1969 = 3,833*

*about 73% for total L78 production (if you assume none were installed in L48 or L34). Not really realistic, so 53% of all 396s. Which means absolute best case 1,429 had other ratio axles install. More realistic is 2,500 of L78's had other axles. Could this many L78's be 3.31 or 3.07's?

H05 (3.73)
1968 = 1,127
1969 = 0

G84 (4.10, 4.56, and 4.88)
Not listed.

Greg

67L78conv · #10 07-18-2011, 11:38 PM

As soon ass I dig the papers out I will let you know what I have. The lists are master accounting lists for all options both standard RPO and COPO options. In the case of the COPO options it tells me what vehicles the option was available on and the price but does not necessarily give the production totals for example it does not show the COPO 427 Camaro totals. If the rear end option has an RPO code like H05 even if it says COPO in the description then it will give me a total in 98% of the cases. If the option like G84 for special order gear ratio covers multiples like 4.10, 4.56 and 4.88 then it only shows the gross total and not a per gear total. These are broken down across each model and grand totals for all models.

Based on what I have seen from Camaro L78 production it would not surprise me at all if that many L78s were 3.55/3.31, 3.07 seems less common but I admit my overall data is not sufficient to draw any strong conclusion on it. A rough rating for overall gear ratio popularity when ordered would be most common to least 3.55, 3.73, 3.31, 4.10, 3.07, 4.56, 2.73, 4.88 when ordering the L78 package. A lot of people seem to have taken what was standard for the gear ratios on the engines for all first gens unless they knew what they were ordering or the dealer nudged them in another direction. Again this is more opinion than fact based on limited data and word of mouth from original owners.