<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: PeteLeathersac</div><div class="ubbcode-body">The info posted above including this link noted below all indicate G84 was req'd w/ a '69 Copo 9511 order, not G80?.
http://www.camaros.org/pdf/options.pdf
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~ Pete </div></div>
As I understand it which may be revised, the COPO 9511 is an override of the G84 4.10 gear set replacing it instead with the 4.56 or 4.88 (have not seen mention of any other gears as of yet). This option (COPO 9511) according to the note is available only when ordered with a posi rear which is G80 $40.00 and the gears cost the same $2.15 as the 4.10's making it $42.15.
In a nutshell to get a 4.56/4.88 you needed to order RPO G84 along with RPO G80 and then override the gear set by adding the COPO 9511 to replace the gear set, final price is still the same as ordering a regular old 4.10 posi at $42.15.
I know I have more on this but need to keep digging, I have gone through a good 8 feet of stacked papers so far so I will keep trying. This is the prime reason I had started my scan everything and post it campaign on my site so we can find info in seconds not days or weeks. Still a long way to go though on that one.