Rear gears?

G_A_B24 · 08-27-2012, 09:41 AM

What is the quickest way to determine what gear ratio is in my '99 Vert? I seen posts that it could be a number of different ratios. It is A/T. I believe a 4L60E.

fishslayer143@yahoo.com · 08-27-2012, 01:11 PM

2.73 is standard w/auto... 3.42 w/manual trans

G_A_B24 · 08-28-2012, 07:17 AM

2.73 is standard w/auto... 3.42 w/manual trans

Thanks, good to know.

Bucwheat · 08-28-2012, 07:52 AM

It should be on a tag in the rear or written in white paint.

Gigity · 08-29-2012, 07:58 PM

If it is an auto, put it in third gear and drive 70 MPH- the RPMs divided by 1000 will match the gear ratio. So if at 70 MPH you are running at 3150 RPM (±), you have the 3.15 performance gear. If you are running at 2730 RPM, you have the 2.73's.

G_A_B24 · 08-31-2012, 10:34 AM

Thanks, I'll try that on the way home from work today.

Gigity · 09-03-2012, 06:00 AM

So.... What did you find out?

G_A_B24 · 09-24-2012, 09:51 AM

They are 2.73's, Sorry for the delay I was in Italy for work and didn't see this post.

fishslayer143@yahoo.com · 09-26-2012, 09:35 AM

its not a bad ratio for a stock engine that you don t run hard...my C5 gets over 28mpg with it... if you want more performance [ I have a C3 for that] increase the ratio to 3.42 or 3.73 ...will make it more responsive at low end but will lower mpg

08-27-2012, 09:41 AM	#1
G_A_B24 Smokin Member Join Date: Aug 2012 Location: Reading, Pa Posts: 13 My Gallery	Rear gears? What is the quickest way to determine what gear ratio is in my '99 Vert? I seen posts that it could be a number of different ratios. It is A/T. I believe a 4L60E. Last edited by G_A_B24; 08-27-2012 at 09:45 AM.

08-28-2012, 07:52 AM	#4
Bucwheat Smokin 4000HP World Challenge Join Date: Oct 2009 Location: Evans Ga.30809 Posts: 4,117 My Gallery	It should be on a tag in the rear or written in white paint. __________________ Casper is a 2012 Corvette Grand Sport 3LT heritage package.

08-29-2012, 07:58 PM	#5
Gigity Smokin 500HP Club Join Date: Jul 2008 Location: Prince Frederick, MD Posts: 728 My Gallery	If it is an auto, put it in third gear and drive 70 MPH- the RPMs divided by 1000 will match the gear ratio. So if at 70 MPH you are running at 3150 RPM (±), you have the 3.15 performance gear. If you are running at 2730 RPM, you have the 2.73's. __________________ Forged LS2, 856 RWHP, Paxton Super Charger @ 18 PSI, Blower Cam, American Racing Headers, 3.73 rear, Corsa Extreme Exhaust, Methanol Injection, Pfadt Coil Over Suspension, ECS Fully Built M6 Transmission Swap

09-03-2012, 06:00 AM	#7
Gigity Smokin 500HP Club Join Date: Jul 2008 Location: Prince Frederick, MD Posts: 728 My Gallery	So.... What did you find out? __________________ Forged LS2, 856 RWHP, Paxton Super Charger @ 18 PSI, Blower Cam, American Racing Headers, 3.73 rear, Corsa Extreme Exhaust, Methanol Injection, Pfadt Coil Over Suspension, ECS Fully Built M6 Transmission Swap

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08-27-2012, 01:11 PM	#2
fishslayer143@yahoo.com Smokin 5000HP+ Posting Maniac Join Date: Jun 2009 Location: New Iberia LA Posts: 6,896 My Gallery	2.73 is standard w/auto... 3.42 w/manual trans

08-28-2012, 07:17 AM	#3
G_A_B24 Smokin Member Join Date: Aug 2012 Location: Reading, Pa Posts: 13 My Gallery	2.73 is standard w/auto... 3.42 w/manual trans Thanks, good to know.

08-31-2012, 10:34 AM	#6
G_A_B24 Smokin Member Join Date: Aug 2012 Location: Reading, Pa Posts: 13 My Gallery	Thanks, I'll try that on the way home from work today.

09-24-2012, 09:51 AM	#8
G_A_B24 Smokin Member Join Date: Aug 2012 Location: Reading, Pa Posts: 13 My Gallery	They are 2.73's, Sorry for the delay I was in Italy for work and didn't see this post.

09-26-2012, 09:35 AM	#9
fishslayer143@yahoo.com Smokin 5000HP+ Posting Maniac Join Date: Jun 2009 Location: New Iberia LA Posts: 6,896 My Gallery	its not a bad ratio for a stock engine that you don t run hard...my C5 gets over 28mpg with it... if you want more performance [ I have a C3 for that] increase the ratio to 3.42 or 3.73 ...will make it more responsive at low end but will lower mpg

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