Performance Axle Ratio
Melting Slicks
Joined: Jun 2001
Posts: 3,123
Likes: 3
From: Orland Park Illinois
St. Jude Donor '06-'07
The gear box should have a Getrag metal tag on the upper right hand side. It'll have the gear ratio on it. You'll have to crawl under the car to check it out. 
Race Director
Joined: Nov 2003
Posts: 14,372
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From: Indianapolis IN
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17
Originally Posted by indy300
Besides looking at a C5's RPO codes, how can you tell if an auto has the performance axle ratio option?
thanks.
thanks.
I wouldn't recommend it on I-465. Maybe I-70 or I-65
Last edited by Cocked and Locked; Jan 1, 2005 at 12:21 PM.
Race Director
Joined: Oct 2004
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From: After reading this thread, I gotta tell ya... you're an ass. .
St. Jude Donor '05-'06-'07-'08-'09-'10-11-'12-'13
This is very helpful. http://home.fuse.net/corvette/rpo.htm
Right link, but I think you allready had that info.
Right link, but I think you allready had that info.
Last edited by DC-STRO; Jan 1, 2005 at 12:32 PM.
Race Director
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From: Indianapolis IN
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17
Originally Posted by DC-STRO
This is very helpful. http://home.fuse.net/corvette/rpo.htm
Race Director
Joined: Oct 2004
Posts: 15,217
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From: After reading this thread, I gotta tell ya... you're an ass. .
St. Jude Donor '05-'06-'07-'08-'09-'10-11-'12-'13
Originally Posted by KernelDee
I thought he said "without looking at the RPO codes
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Race Director
Joined: Nov 2003
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From: Indianapolis IN
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17
Originally Posted by indy300
Sounds like there is no "easy" way to tell. Kind of what I thought.
I was waiting for someone to say, "open the differential...count the teeth...yada yada yada"
Thank you guys
I was waiting for someone to say, "open the differential...count the teeth...yada yada yada"
Thank you guys
Safety Car
Joined: Feb 2001
Posts: 4,303
Likes: 347
From: yardley, pa 19067
I think I remember reading that at 70 m.p.h.(in overdrive) you will be running at around 1945 rpm's if you have the 3.15's...If you have the stock 2.73's it's lower(around 1700 rpm's)...
Race Director
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From: Indianapolis IN
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17
Originally Posted by Stingrayrob
I think I remember reading that at 70 m.p.h.(in overdrive) you will be running at around 1945 rpm's if you have the 3.15's...If you have the stock 2.73's it's lower(around 1700 rpm's)...
Melting Slicks
Joined: Nov 2003
Posts: 2,887
Likes: 2
From: Macomb MI
St. Jude Contributor
Originally Posted by indy300
Besides looking at a C5's RPO codes, how can you tell if an auto has the performance axle ratio option?
thanks.
thanks.
Post the last 8 digits of your vehicle number, and I'll tell you what you have.
Easy enough
Race Director
Joined: Nov 2003
Posts: 14,372
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From: Indianapolis IN
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17
Originally Posted by Sponge Vette
Post the last 8 digits of your vehicle number, and I'll tell you what you have.
Easy enough
Easy enough
Melting Slicks
Joined: Jun 2001
Posts: 3,123
Likes: 3
From: Orland Park Illinois
St. Jude Donor '06-'07
Originally Posted by Stingrayrob
I think I remember reading that at 70 m.p.h.(in overdrive) you will be running at around 1945 rpm's if you have the 3.15's...If you have the stock 2.73's it's lower(around 1700 rpm's)...
This quote is 100% correct (assuming you have stock rear tires).
2.73 in drive @ 70 mph = 1685 rpm
3.15 in drive @ 70 mph = 1945 rpm
3.42 in drive @ 70 mph = 2110 rpm
Last edited by BiggieBoy; Jan 1, 2005 at 04:18 PM.
Team Owner
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From: S.W. Ohio. . . . . . NRA Life Member
Le Mans Master
Joined: Jun 2004
Posts: 6,269
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From: Dallas Texas
St. Jude Donor '06-'07-'09-'10
Originally Posted by indy300
Sounds like there is no "easy" way to tell. Kind of what I thought.
I was waiting for someone to say, "open the differential...count the teeth...yada yada yada"
Thank you guys
I was waiting for someone to say, "open the differential...count the teeth...yada yada yada"
Thank you guys
Sure there is, you jack the car up and turn the wheels and count the number of driveshaft revolutions.
