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Old Nov 22, 2009 | 05:33 PM
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Default dif ratio
how can i tell what my ratio is 2.73 or 3.05??is there a build code to tell which is which....
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Old Nov 23, 2009 | 12:09 AM
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St. Jude Donor '10-'12-'13-'14-'15-'16-'17
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Build codes:
GU2 Axle, Rear, 2.73 Ratio
GU6 Axle, Rear, 3.42 Ratio
G90 Axle, Rear, 3.15 Ratio
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Old Nov 23, 2009 | 08:26 AM
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Originally Posted by retiredalaskan
how can i tell what my ratio is 2.73 or 3.05??is there a build code to tell which is which....
If you had filled out your profile, or at least mentioned the year of your car you would have learned where to find the build code. If you already know, that's fine. It will help to get better answers to either fill out the profile or give more info in your question.
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Old Nov 23, 2009 | 08:36 AM
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Originally Posted by retiredalaskan
is there a build code
The RPO build codes are listed on a sticker that's usually located on the inside of the glove box door.
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Old Nov 23, 2009 | 08:41 AM
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Originally Posted by Quicksilver Vert 01
The RPO build codes are listed on a sticker that's usually located on the inside of the glove box door.
Except on 97-99 models, which are on the rear driver's side storage cover. And that brings us back to mentioning the year of the car in the question or the profile.
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Old Nov 23, 2009 | 01:56 PM
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Default c5
thank you G90 3.15
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Old Nov 23, 2009 | 02:43 PM
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Originally Posted by 65GGvert
Except on 97-99 models, which are on the rear driver's side storage cover. And that brings us back to mentioning the year of the car in the question or the profile.
My 99 had the build code on the inside of the glove box
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Old Nov 23, 2009 | 02:57 PM
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Originally Posted by David426
My 99 had the build code on the inside of the glove box
I'm not sure why, unless it was a change during the year. My 98 and a friend's 99 FRC were in the storage compartment.
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Old Nov 23, 2009 | 03:22 PM
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Originally Posted by 65GGvert
I'm not sure why, unless it was a change during the year. My 98 and a friend's 99 FRC were in the storage compartment.
Did '99 FRCs come with compartment covers? My '00 didn't.
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Old Nov 24, 2009 | 08:53 AM
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Originally Posted by David426
My 99 had the build code on the inside of the glove box
On later C5's, GM probably decided on placing the RPO sticker in a place that was less likely to be removed or lost.
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Old Nov 24, 2009 | 09:23 AM
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Originally Posted by 2KFRC5
Did '99 FRCs come with compartment covers? My '00 didn't.
Was your 99 code list in the glove box?
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Old Nov 24, 2009 | 09:43 AM
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There is also a tag on the rear of the differential if you are under there looking around
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Old Nov 24, 2009 | 09:50 AM
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Originally Posted by markcvechko
There is also a tag on the rear of the differential if you are under there looking around
But that would make it way too easy!
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Old Nov 24, 2009 | 05:55 PM
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Originally Posted by 65GGvert
Was your 99 code list in the glove box?
I don't have a '99. Yes, my '00 is in the glove box. And the compartment covers were not offered for the '00 FRC. That's why I was wondering if the covers came with the '99 FRC. The parts catalog doesn't list covers for the '99-'00 FRC, but do list them for the vert and cpe.
Last edited by 2KFRC5; Nov 24, 2009 at 06:05 PM.
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Old Nov 24, 2009 | 07:47 PM
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They had a side cover on the driver's side that came off if I'm remembering correctly. It's been about 3 years, so it could have been anywhere.
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Old Nov 24, 2009 | 08:16 PM
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Originally Posted by retiredalaskan
how can i tell what my ratio is 2.73 or 3.05??is there a build code to tell which is which....
I used this chart that Mr. Bill posted and it matched up correct

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Old Nov 25, 2009 | 11:53 AM
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http://mikemercury.home.att.net/ratio.htm
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