• Got the Contributing Memberships stuff finally worked out and made up a thread as a sort of "How-To" to help people figure out how to participate. So if you need help figuring it out, here's the thread you need to take a look at -> http://www.corvetteflorida.com/forums/showthread.php?t=3581 Thank you, everyone! Rich Z.

C6 Rear Gear Ratio

Lou G

Lou G

New member
I have an '06 convertible manual trans and would like to know what the gear ration is on the rear end.

All my window sticker says is Limited Slip Differential which I think means posi-traction.

I ordered the Vette and did not include any rear end options (if there were any).

:shrug01::shrug01:

Lou
 
Option codes as follows:

GM8 2.56

GM9 3.63

GU6 3.42

They only made 8 with the GM9 and all 8 were Z06 cars.
 
85vette said:
Option codes as follows:

GM8 2.56

GM9 3.63

GU6 3.42

They only made 8 with the GM9 and all 8 were Z06 cars.
Click to expand...

Yes, I saw the option codes but couldn't find it in my paperwork.
There were 8,127 convertibles with a 2.56 and 3,024 with a 3.42.
Am thinking I have a 2.56 because of the low rpms at high speeds but maybe Mark is right and it is a 3.42.
I was just wondering what I had. I am thinking of doing a couple of upgrades to beef up the horsepower and thought it would be a good thing to know what the gear ration was.

Thanks for the comments.

Lou
 
3.42 for ALL manual trannies, no optional rear axle ratio. 2.56 for automatics unless you order the optional 2.73 ratio or get the Z51 option, which gets you the 2.73 ratio as part of the Z51 package.

stolen from the big forums.
 
LS2POWA said:
3.42 for ALL manual trannies, no optional rear axle ratio. 2.56 for automatics unless you order the optional 2.73 ratio or get the Z51 option, which gets you the 2.73 ratio as part of the Z51 package.

stolen from the big forums.
Click to expand...

Thank you!!

85Vette, Thank you also. I will look in the glove box and see it the RPO codes are there.

Lou
 
LS2POWA said:
3.42 for ALL manual trannies, no optional rear axle ratio. 2.56 for automatics unless you order the optional 2.73 ratio or get the Z51 option, which gets you the 2.73 ratio as part of the Z51 package.

stolen from the big forums.
Click to expand...

I'm curious, what is the code for the 2.73? I only find the three above mentioned gear ratios (2.56, 3.63, and 3.42) on the Bowling Green RPO sheet. It does list the Z51 six speed as MZ6 versus the standard six speed as a MM6, but makes no mention of a 2.73 gear set.
 
Dont know the code, but I know it was an option. I spent a lot of time looking at C6s. It was only available for the Z51s with the A6 though, unless you knew your local dealer well which had ties to the factory.
 
Thanks to you guys, my quest has ended. I found the tag in the glove box.
It has the GU6 RPO code for a 3.42 rear.

I asked my friend to look at his tag, he has an auto '06 with the Z51 option, and his RPO code is GM8 for a 2.56 rear.

Like you guys, I have not seen a RPO code for a 2.73 rear. The following web page has the 2006 Vette Production Options. www.vettefacts.com/C6/2006.aspx

I looked at the www.vettefacts.com/c4/1985.aspx but did not see a RPO code for the rear.

Thanks again.
Lou
 
Lou G said:
Thanks to you guys, my quest has ended. I found the tag in the glove box.
It has the GU6 RPO code for a 3.42 rear.

I asked my friend to look at his tag, he has an auto '06 with the Z51 option, and his RPO code is GM8 for a 2.56 rear.

Like you guys, I have not seen a RPO code for a 2.73 rear. The following web page has the 2006 Vette Production Options. www.vettefacts.com/C6/2006.aspx

I looked at the www.vettefacts.com/c4/1985.aspx but did not see a RPO code for the rear.

Thanks again.
Lou
Click to expand...
C5 are 2.73 Auto A4 and upgrade to 3.15
 
That website doesnt show the A6 paddle shift with Z51.

The RPO code is called GU2 for 08+

2005 Non Z51 Manual 3.42
2005 Z51 Manual 3.42
2005 Non Z51 Automatic 2.73
2005 Z51 Automatic 2.73
2005 Optional performance axle ratio available for A4 automatics, 3.15 (Z51 or non).

2006 - 2007 Non Z51 Manual 3.42
2006 - 2007 Z51 Manual 3.42
2006 - 2007 Non Z51 Automatic 2.56
2006 - 2007 Z51 Automatic 2.56

2008 - 2009 Non Z51 Manual 3.42
2008 - 2009 Z51 Manual 3.42
2008 - 2009 Non Z51 Automatic 2.56
2008 - 2009 Z51 Automatic 2.73
2008 - 2009 Optional performance axle for A6 automatics 2.73 (Z51 or non)
 
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