Transmision question
Thread Starter
Intermediate
Joined: Mar 2009
Posts: 33
Likes: 0
From: Houston Texas
Transmision question
I'm new to the site and to corvette's. I'm looking at getting used vette. I really want a standard but I have found a pretty good deal on a automatic and I don't know if I can pass it up. So I was wondering how strong are the Automatic transmisions in the c6 vettes? Just in case I ever decied to heavaly modify the vette. Thanks for the help 
Team Owner
Joined: Apr 2005
Posts: 35,749
Likes: 148
From: Northern NYs Adirondack Mountains,http://www.visitsacandaga.com.
The auto in 05 was a 4spd tranny. The newer years went to 6spd Autos, Make sure you know what rear end ratio is in your auto cars if your looking for max performence!
I have a 07Z and had a 05 6spdM All manuals have a 3.42!
Team Owner
Joined: Sep 2005
Posts: 20,352
Likes: 568
From: Ventura County, Calif
Standard rear end for '05 A4 was 2.73, the performance axle was 3.15. You would probably be happier with the 3.15. 
As said, all manual trans cars have 3.42 axles.
The A4 in the '05's is a pretty good trans, not great, but pretty good. I have a friend here with a modded '05 A4. I think he is at 425 rwhp and the trans has not been any problem at all. Here is a thread from last year with a post showing the difference btw the A4 in the C5's and the new A4 in the '05 C6:
http://forums.corvetteforum.com/c6-c...a4-tranny.html
Of course you know that if you get a Z51 with manual trans the gearing in the trans is different (lower, higher numerically) than the standard manual.
As said, all manual trans cars have 3.42 axles.The A4 in the '05's is a pretty good trans, not great, but pretty good. I have a friend here with a modded '05 A4. I think he is at 425 rwhp and the trans has not been any problem at all. Here is a thread from last year with a post showing the difference btw the A4 in the C5's and the new A4 in the '05 C6:
http://forums.corvetteforum.com/c6-c...a4-tranny.html
Of course you know that if you get a Z51 with manual trans the gearing in the trans is different (lower, higher numerically) than the standard manual.
Thread Starter
Intermediate
Joined: Mar 2009
Posts: 33
Likes: 0
From: Houston Texas
Thank I thought that all of the C6 vette had 6spdM and 6spdA
Thread Starter
Intermediate
Joined: Mar 2009
Posts: 33
Likes: 0
From: Houston Texas
Standard rear end for '05 A4 was 2.73, the performance axle was 3.15. You would probably be happier with the 3.15. As said, all manual trans cars have 3.42 axles.
The A4 in the '05's is a pretty good trans, not great, but pretty good. I have a friend here with a modded '05 A4. I think he is at 425 rwhp and the trans has not been any problem at all. Here is a thread from last year with a post showing the difference btw the A4 in the C5's and the new A4 in the '05 C6:
http://forums.corvetteforum.com/c6-c...a4-tranny.html
Of course you know that if you get a Z51 with manual trans the gearing in the trans is different (lower, higher numerically) than the standard manual.
As said, all manual trans cars have 3.42 axles.The A4 in the '05's is a pretty good trans, not great, but pretty good. I have a friend here with a modded '05 A4. I think he is at 425 rwhp and the trans has not been any problem at all. Here is a thread from last year with a post showing the difference btw the A4 in the C5's and the new A4 in the '05 C6:
http://forums.corvetteforum.com/c6-c...a4-tranny.html
Of course you know that if you get a Z51 with manual trans the gearing in the trans is different (lower, higher numerically) than the standard manual.
What about the automatic tranny in a vette with the Z51 package on it?
Team Owner
Joined: Sep 2005
Posts: 20,352
Likes: 568
From: Ventura County, Calif
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Instructor
Joined: Sep 2008
Posts: 207
Likes: 0
From: BEAUFORT SC
I have a 2009 Z51 A6 with the 2.73 rear axle ratio. It works just fine and I especially like the A6 when driving in traffic, which occurs more frequently than I would like. I generally prefer manual transmissions and at times I wish I had one, but most of the time I'm glad I have the automatic. It's not perfect, but it does the job -- especially with the paddle shifters. I'm sure others may disagree, but for me at this time,
it's just fine. Everyone has their own preference though. Good luck.
it's just fine. Everyone has their own preference though. Good luck.
Team Owner
Joined: Aug 2002
Posts: 35,617
Likes: 167
Tech Contributor
Cruise-In 11 Veteran
NCM Ambassador
St. Jude Donor '05-'06-'07-'10
2005 Z51 Manual 3.42
2005 Non Z51 Automatic 2.73 standard
2005 Z51 Automatic 3.15 standard
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 standard
2008 - 2009 Optional performance axle for A6 automatics 2.73 (Z51 or non)
Last edited by talon90; Mar 24, 2009 at 08:22 PM. Reason: corrected 2005 A4 Z51 standard gearing to reflect 3.15
Team Owner
Joined: May 2004
Posts: 82,175
Likes: 1,319
From: McKinney TX
St. Jude Donor '21-'22-'23-'24
Paul, I think the 3.15 rear axle ratio was standard with the Z51 option for automatics for 2005.
Team Owner
Joined: Aug 2002
Posts: 35,617
Likes: 167
Tech Contributor
Cruise-In 11 Veteran
NCM Ambassador
St. Jude Donor '05-'06-'07-'10
I actually don't think that it was Jim. I believe that it was strictly a free form option in 2005. Easy enough to find out. Any 2005 owner with an automatic could simply to check their RPO list in the glove and check for G90.
Drifting
Joined: Oct 2007
Posts: 1,565
Likes: 2
From: The Great Pacific Northwest...........I carry a gun cause a cops too heavy.
Team Owner
Joined: Aug 2002
Posts: 35,617
Likes: 167
Tech Contributor
Cruise-In 11 Veteran
NCM Ambassador
St. Jude Donor '05-'06-'07-'10
Did you order the G90 as an option or did it simply come with it? (sticker would list the $395 option if yes) Like the 2008 it was available as a free form option and anyone with an automatic could order it. The question still remains as to whether it was included (no charge as part of the Z51) or simply ordered as a free form option.
Pro
Joined: Jan 2009
Posts: 605
Likes: 28
From: Havelock North Carolina
I have an 05 A4 Z51 with 3:15 and the RPO in the glovebox shows G90.
It doesn't mean its right but I just checked the Corvette museum website and it shows that the 3:15 was an option for for the A4, with the 3:42 being the standard for the manuals, Z51 or not.
It doesn't mean its right but I just checked the Corvette museum website and it shows that the 3:15 was an option for for the A4, with the 3:42 being the standard for the manuals, Z51 or not.
Last edited by Sunset Orng 05; Mar 24, 2009 at 08:12 PM. Reason: Verification
Team Owner
Joined: Sep 2005
Posts: 20,352
Likes: 568
From: Ventura County, Calif
Team Owner
Joined: Feb 2000
Posts: 53,520
Likes: 77
From: Arizona
Team Owner
Joined: Feb 2000
Posts: 53,520
Likes: 77
From: Arizona
I'm new to the site and to corvette's. I'm looking at getting used vette. I really want a standard but I have found a pretty good deal on a automatic and I don't know if I can pass it up. So I was wondering how strong are the Automatic transmisions in the c6 vettes? Just in case I ever decied to heavaly modify the vette.
DBS, dead battery syndrome, fixed with BCM reflash upgrade.
And early '05 clutches had some troubles. Mine had the clutch sticking to the floor problem.
And then there's the harmonic dampener problem if the VIN is less than 11039. This affects either tranny.
Make sure that you have the vehicles service record, and make sure that all the teething problems have been fixed.
And seriously consider a warranty.