"Performance gear ratio" ?
Thread Starter
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Joined: Oct 2008
Posts: 57
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"Performance gear ratio" ?
My 90 Coupe came with the original window sticker. I was looking at it a while ago and noticed one of the options was "performance gear ratio." Anyone know what gear ratio that is?
Burning Brakes
Joined: Oct 2005
Posts: 824
Likes: 30
From: San Pablo California
Not sure on your 90 but inside the center consul door on my 87 is a sticker that lists all of the options that the car was delivered with and this includes the rear axle ratio of which mine is a 3.07
Safety Car
Joined: Jan 2004
Posts: 3,556
Likes: 13
It is identification of the fact that the optional ratio for that year has been installed.
The actual diff ratio is identified by the normal RPO code listed ;
G??
Pro
Joined: Apr 2000
Posts: 696
Likes: 18
From: Jenkintown PA
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
Because you have a convertible and if it has an automatic tranny, the Performance ratio will be a 2.73 RPO GU2. The standard 'vert ratio with and A4 was a 2.59 RPO GM1.
Last edited by c4cruiser; Dec 8, 2008 at 07:47 PM.
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Drifting
Joined: Jul 2006
Posts: 1,483
Likes: 3
From: Newark, New Jersey
G92 simply means "performance gear ratio"
G44 means 3.07 ratio which was the optional ratio in my case a 86 coupe.
Racer
Joined: Sep 2005
Posts: 449
Likes: 1
From: Victoria
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
........................................ .........
G44 - 3.07 Rear Axle Ratio
GHO - 3.54 Rear Axle Ratio
GM1 - 2.59 Rear Axle Ratio
GM3 - 3.45 Rear Axle Ratio
GT7 - 3.33 rear axle ratio
GU2 - 2.73 Rear Axle Ratio
G87 - ring gear 8.50 inch
G92 - Performance Axle Ratio
........................................ .........
G87 = D44 (in C4)
G92 means the installed ratio is the optional one for that MY.
Last edited by rodj; Dec 11, 2008 at 05:31 PM.
Pro
Joined: May 2006
Posts: 536
Likes: 0
From: Humble Texas
My code says Im running a 2:59 rear ratio in my 96LT1 Auto,
my question is why is it no one runs high gears , like 355 373
if you have a 6 spd seems you could have low end and a decent top end speed.and Automatics are 5 speed ..im from the old school where i use to run 411's and 456's on the street.. running either 4 speed stick or 3 speed auto.
Just Wondering ?
my question is why is it no one runs high gears , like 355 373
if you have a 6 spd seems you could have low end and a decent top end speed.and Automatics are 5 speed ..im from the old school where i use to run 411's and 456's on the street.. running either 4 speed stick or 3 speed auto.
Just Wondering ?
Last edited by ol school; Dec 12, 2008 at 11:27 PM.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Some guys are running lower ratios with autos.
See
http://forums.corvetteforum.com/c4-t...or-3-73-a.html
Melting Slicks
Joined: May 2007
Posts: 2,171
Likes: 1
From: Warwick RI
My code says Im running a 2:59 rear ratio in my 96LT1 Auto,
my question is why is it no one runs high gears , like 355 373
if you have a 6 spd seems you could have low end and a decent top end speed.and Automatics are 5 speed ..im from the old school where i use to run 411's and 456's on the street.. running either 4 speed stick or 3 speed auto.
Just Wondering ?
my question is why is it no one runs high gears , like 355 373
if you have a 6 spd seems you could have low end and a decent top end speed.and Automatics are 5 speed ..im from the old school where i use to run 411's and 456's on the street.. running either 4 speed stick or 3 speed auto.
Just Wondering ?
