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Author Topic: 67 Z28 rear end ratio options  (Read 1526 times)
Jason Rhoades
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« on: September 25, 2010, 02:25:23 PM »

Hi everyone,
Been researching these cars for quite some time and finally made the plunge earlier this week, picking up a '67 coupe.

My project is to build an exacting replica of a '67 Z28, perform some very mild modifications, and go race the car with the SCCA.  I go into a bit more detail about it in my blog:
http://www.rhoadescamaro.com/build

One thing I haven't been able to figure out, is what final drive ratios were available to the Z28 in 1967.  I know the 3.73 was standard.  I've seen conflicting things about the optional ratios.  The 3.53 is okay but I am also interested in running the 4.88.  In my weird case, there don't even have to have been any cars actually delivered with the 4.88, only that it was an available option that year, from the factory.  I've practically memorized the options.pdf from this site - is there any sort of scanned in ancient factory order options sheet or something like that?

I already have all the factory books, and Jerry MacNeish's and a couple other books on order.  Hoping to find the answer.

Thanks so much!
Jason
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flyingskibiker
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« Reply #1 on: September 26, 2010, 01:28:20 AM »

Wow, huge jump - 3.73 to 4.88.  Anyway, I would think that if it was available as an option, one could order it if they wanted.  Jerry's book lists all the usual ratio options...
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RAfbody
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« Reply #2 on: September 26, 2010, 10:45:30 AM »

Here is an RPO list showing the ratio's and codes.    http://www.camaros.org/drivetrain.shtml#AxleCodes
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Russ
JohnZ
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« Reply #3 on: September 26, 2010, 11:06:40 AM »

Box 32 on the '67 Dealer Order Form was for axles - if nothing was checked, you got the standard axle for the engine/transmission combination chosen. If you wanted somethng different, there was a space for the "economy" axle, a space for the "performance" axle, and a box for a "write-in" for a "special" axle where you specified the ratio you wanted. Eight ratios were available and coded, from 2.73 to 4.88.
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'69 Z/28
Fathom Green
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Jason Rhoades
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« Reply #4 on: September 26, 2010, 11:51:44 AM »

Yep, I saw that list, but some of the codes apparently weren't actually available despite being listed.  There's this line from the options.pdf that suggests the 4.88 may have only been available in '69:
RPO          1967                           1968                         1969               Description    Option Dependencies
CODE   QTY   List$   D&H$    QTY   List$   D&H$      QTY   List$   D&H$                       Requires N/A With

9511     n/a                         n/a                              tbd $40.00 2.15      4.56 and 4.88 axle ratio (69 only)
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acelr8
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« Reply #5 on: September 26, 2010, 04:42:12 PM »

I don't know about 67 but in 68 4.88 was available in a Z.Jeff
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KurtS
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« Reply #6 on: September 26, 2010, 10:30:54 PM »

That's not what the RPO list is saying.
In 69, 4.56 and 4.88 were COPO orders. 67 and 68 didn't have production totals for those ratios.

Jerry shows about 10% of 67 Z's had 4.88.
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Kurt S
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Jason Rhoades
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« Reply #7 on: September 26, 2010, 11:17:03 PM »

Cool, thanks everyone!  Looking forward to Jerry's book arriving, it should have the documentation I need.
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