All 96 manual transmissions are LT-4 engines and 3:45 axle ratio.
C4 rear diff ratio?
Thread Starter
Pro
Joined: Jul 2002
Posts: 513
Likes: 2
From: Virginia Beach Va
C4 rear diff ratio?
I'm posting this for a friend with a C4...can anyone help?
In researching my '96 LT4 coupe I have found several referals to a G92 Perf Rear Ratio but I have never been able to determine what the ratio is. Does anyone know?
In researching my '96 LT4 coupe I have found several referals to a G92 Perf Rear Ratio but I have never been able to determine what the ratio is. Does anyone know?
Le Mans Master
Joined: May 2006
Posts: 9,226
Likes: 9
From: Irvine Ca
If all else fails, it is etched into the bottom of the housing. Lift it up a little and slide under there...the ratio that they installed in the housing will be hand etched.
Of course you could look at the RPO codes located under the rear storage bin.
Of course you could look at the RPO codes located under the rear storage bin.
Melting Slicks
Joined: Sep 2001
Posts: 2,301
Likes: 5
From: Bedford, IN
There should be a second G code to match one these rarios.
•G44 - Rear axle 3.07 ratio
•G87 - Ring gear 8.50 inch
•G92 - Rear axle performance ratio
•GH0 - Rear axle 3.54 ratio
•GM1 - Rear axle 2.59 ratio
•GM3 - Rear axle 3.45 ratio
•GT7 - Rear axle 3.33 ratio
•GU2 - Rear axle 2.73 ratio
•GW4 - Rear axle 3.31 ratio
EDIT: I got that info Here
•G44 - Rear axle 3.07 ratio
•G87 - Ring gear 8.50 inch
•G92 - Rear axle performance ratio
•GH0 - Rear axle 3.54 ratio
•GM1 - Rear axle 2.59 ratio
•GM3 - Rear axle 3.45 ratio
•GT7 - Rear axle 3.33 ratio
•GU2 - Rear axle 2.73 ratio
•GW4 - Rear axle 3.31 ratio
EDIT: I got that info Here
Last edited by Shrek; Aug 5, 2009 at 01:44 PM.
Team Owner
Joined: Aug 2005
Posts: 34,988
Likes: 515
From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09 thru '20
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
It means the car is fitted with the optional ratio that was available for that year; it is not a "particular " ratio.In most cases the ratio is lower so it is a "performance ratio
Last edited by rodj; Aug 5, 2009 at 05:23 PM.
Team Owner
Joined: May 1999
Posts: 22,830
Likes: 13
From: Columbus Ohio
CI 3-4, 8-9-10 Veteran
St. Jude Donor '06-'08-'10
There will be two RPO codes.
One is the G92 and tells you that it has the Perf Rear Ratio, the other tells you what that ratio is.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
1st Gear
Joined: Feb 2022
Posts: 1
Likes: 0
Team Owner
Joined: Sep 2003
Posts: 25,348
Likes: 2,728
What is the VIN of the car that brought you here to post? A snapshot of the rear that the 'yard' provided?
Intermediate
Joined: Nov 2024
Posts: 26
Likes: 0
There should be a second G code to match one these rarios.
•G44 - Rear axle 3.07 ratio
•G87 - Ring gear 8.50 inch
•G92 - Rear axle performance ratio
•GH0 - Rear axle 3.54 ratio
•GM1 - Rear axle 2.59 ratio
•GM3 - Rear axle 3.45 ratio
•GT7 - Rear axle 3.33 ratio
•GU2 - Rear axle 2.73 ratio
•GW4 - Rear axle 3.31 ratio
EDIT: I got that info Here
•G44 - Rear axle 3.07 ratio
•G87 - Ring gear 8.50 inch
•G92 - Rear axle performance ratio
•GH0 - Rear axle 3.54 ratio
•GM1 - Rear axle 2.59 ratio
•GM3 - Rear axle 3.45 ratio
•GT7 - Rear axle 3.33 ratio
•GU2 - Rear axle 2.73 ratio
•GW4 - Rear axle 3.31 ratio
EDIT: I got that info Here
Intermediate
Joined: Nov 2024
Posts: 26
Likes: 0
Team Owner
Joined: Sep 2003
Posts: 25,348
Likes: 2,728
There's many RPO deciphering apps out there and .pdf from many vendors including GM/ACD.
