From a C4 to a C5 ?
Thread Starter
Melting Slicks
Joined: Mar 2003
Posts: 2,928
Likes: 55
From: Port Saint Lucie, Florida
From a C4 to a C5 ?
Hi
In my 02 C4 i changed the thermostat to a 160 deg, what do i hve now in a. c6 07 auto.
Also i have had the z-51 option in my last two vettes is the perf rear still 3:15 ?
Thanks
Alan
In my 02 C4 i changed the thermostat to a 160 deg, what do i hve now in a. c6 07 auto.
Also i have had the z-51 option in my last two vettes is the perf rear still 3:15 ?
Thanks
Alan
Team Owner
Joined: May 2004
Posts: 82,175
Likes: 1,319
From: McKinney TX
St. Jude Donor '21-'22-'23-'24
An 02 is not a C4, it's a C5.
The 2005 C6 had the 3.15 rear axle ratio that came with the Z51 option package if it had an automatic transmission. What other model year C6s were you asking about?
All C6s with manual transmission have a 3.42 rear axle ratio.
The 2005 C6 had the 3.15 rear axle ratio that came with the Z51 option package if it had an automatic transmission. What other model year C6s were you asking about?
All C6s with manual transmission have a 3.42 rear axle ratio.
Thread Starter
Melting Slicks
Joined: Mar 2003
Posts: 2,928
Likes: 55
From: Port Saint Lucie, Florida
Whatever rear it is coming with will be fine but i was sure it dhould be the 3:15
Alan
Ps Still learning
Team Owner
Joined: May 2004
Posts: 82,175
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From: McKinney TX
St. Jude Donor '21-'22-'23-'24
Although all C6s with manual transmission have the 3.42 rear axle ration, different model year automatics had different rear axle ratios. It could be 2.56, 2.73, or 3.15.
Thread Starter
Melting Slicks
Joined: Mar 2003
Posts: 2,928
Likes: 55
From: Port Saint Lucie, Florida
coming
What model year do you have coming, and is it a manual transmission or an automatic transmission? If we know that, we can probably tell you what rear axle ratio it has.
Although all C6s with manual transmission have the 3.42 rear axle ration, different model year automatics had different rear axle ratios. It could be 2.56, 2.73, or 3.15.
Although all C6s with manual transmission have the 3.42 rear axle ration, different model year automatics had different rear axle ratios. It could be 2.56, 2.73, or 3.15.
Alan
Team Owner
Joined: May 2004
Posts: 82,175
Likes: 1,319
From: McKinney TX
St. Jude Donor '21-'22-'23-'24
I looked it up in the Order Guide. 2005 was the only year that the automatic tranny came with the 3.15 rear axle.
Model year 2007 with automatic transmission had a 2.56 rear axle ratio. No other one available for the automatic. Same with model year 2006. Even the Z51 package only had 2.56.
However, model year 2008 and model year 2009, 2.56 was standard, but the Z51 package came with 2.73.
Here's a link to charts telling you what rpm your engine should be turning at certain speeds for different rear axle ratios.
http://mysite.verizon.net/foofoo2/c6/
These are the numbers for a rear axle ratio of 2.56:
In 3rd gear, at 20 MPH, the engine should be doing 1,000 RPM.
In 3rd gear, at 40 MPH, the engine should be doing 2,000 RPM.
Model year 2007 with automatic transmission had a 2.56 rear axle ratio. No other one available for the automatic. Same with model year 2006. Even the Z51 package only had 2.56.
However, model year 2008 and model year 2009, 2.56 was standard, but the Z51 package came with 2.73.
Here's a link to charts telling you what rpm your engine should be turning at certain speeds for different rear axle ratios.
http://mysite.verizon.net/foofoo2/c6/
These are the numbers for a rear axle ratio of 2.56:
In 3rd gear, at 20 MPH, the engine should be doing 1,000 RPM.
In 3rd gear, at 40 MPH, the engine should be doing 2,000 RPM.
Last edited by Vette_DD; Aug 3, 2014 at 02:36 PM.
Race Director
Joined: Mar 2005
Posts: 11,549
Likes: 27
From: Southampton NJ
I looked it up in the Order Guide. 2005 was the only year that the automatic tranny came with the 3.15 rear axle.
Model year 2007 with automatic transmission had a 2.56 rear axle ratio. No other one available for the automatic. Same with model year 2006. Even the Z51 package only had 2.56.
However, model year 2008 and model year 2009, 2.56 was standard, but the Z51 package came with 2.73.
Here's a link to charts telling you what rpm your engine should be turning at certain speeds for different rear axle ratios.
http://mysite.verizon.net/foofoo2/c6/
These are the numbers for a rear axle ratio of 2.56:
In 3rd gear, at 20 MPH, the engine should be doing 1,000 RPM.
In 3rd gear, at 40 MPH, the engine should be doing 2,000 RPM.
Model year 2007 with automatic transmission had a 2.56 rear axle ratio. No other one available for the automatic. Same with model year 2006. Even the Z51 package only had 2.56.
However, model year 2008 and model year 2009, 2.56 was standard, but the Z51 package came with 2.73.
Here's a link to charts telling you what rpm your engine should be turning at certain speeds for different rear axle ratios.
http://mysite.verizon.net/foofoo2/c6/
These are the numbers for a rear axle ratio of 2.56:
In 3rd gear, at 20 MPH, the engine should be doing 1,000 RPM.
In 3rd gear, at 40 MPH, the engine should be doing 2,000 RPM.
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Team Owner
Joined: May 2004
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From: McKinney TX
St. Jude Donor '21-'22-'23-'24
As I indicated above, the 2007 C6 with automatic transmission has the 2.56 rear axle. That's the only one available with auto for that model year. Doesn't matter whether your car has the Z51 option package or not - the car has the 2.56 rear axle.
Last edited by Vette_DD; Oct 29, 2016 at 06:13 PM.
Thread Starter
Melting Slicks
Joined: Mar 2003
Posts: 2,928
Likes: 55
From: Port Saint Lucie, Florida
Z-51 rear
Hi
Now i remember that when i was looking to buy an 05 it listed the Z-51 package and 3:15 rear so assumed they would all have it.
Sorry
Alan
PS why 2.56 instead of the 3:15?
Team Owner
Joined: May 2004
Posts: 82,175
Likes: 1,319
From: McKinney TX
St. Jude Donor '21-'22-'23-'24