Rear ratio?
Melting Slicks
Joined: Jan 2002
Posts: 2,238
Likes: 4
From: Milan
I have a 90 vert auto with the G92 option and I checked (turning the rear wheel one turn and seeing how many turns does the shaft) and it is a 2.73.
The best way to check is to turn the rear wheel 10 times and see if the shaft turns 26 times, 27 times or 31 times (the first is 2.59 , the second scenario is 2.73, and the third is 3.07.
-Beppe-
The best way to check is to turn the rear wheel 10 times and see if the shaft turns 26 times, 27 times or 31 times (the first is 2.59 , the second scenario is 2.73, and the third is 3.07.
-Beppe-
Team Owner
Joined: Sep 2001
Posts: 62,160
Likes: 1,733
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
I'd bet money its the 2.73
But youll have to check your RPO codes for the other code starting with G, thats the axle ratio.
But youll have to check your RPO codes for the other code starting with G, thats the axle ratio.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by EPiC Vette
On my '89 AT:
G44 G92
3.07 with Performance Ratio. Or so it's SUPPOSED to be!
-E
G44 G92
3.07 with Performance Ratio. Or so it's SUPPOSED to be!
-E
RACE ON!!!
Thread Starter
Le Mans Master
Joined: May 2000
Posts: 7,033
Likes: 12
Re:The G92 means nothing, really.
Yes it does, it means it doesn't have the base axle in the car. SO what I am trying to figure out is what ratio is in a vert auto with g92 2.73 or 3.07. Seems I read somewhere that they didn't put the 3.07 in the verts. Guess I will have to go spin the driveshaft.
Yes it does, it means it doesn't have the base axle in the car. SO what I am trying to figure out is what ratio is in a vert auto with g92 2.73 or 3.07. Seems I read somewhere that they didn't put the 3.07 in the verts. Guess I will have to go spin the driveshaft.
Instructor
Joined: Apr 2000
Posts: 171
Likes: 0
From: waukesha, wi usa
From the factory they wrote on the bottom of the differential the part number and ratio in black magic marker. You may have to clean any grease and grime off. Use something like Windex so that you dont take off the black marker.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by hippy
Re:The G92 means nothing, really.
Yes it does, it means it doesn't have the base axle in the car.
Yes it does, it means it doesn't have the base axle in the car.
RACE ON!!!
Safety Car
Joined: Sep 2000
Posts: 3,524
Likes: 4
From: Hinckley Ohio
Originally Posted by hippy
What axle does a 90 auto vert have with the g92, is it a 3.07 or 2.73?
What varied between auto-coupe and auto-convertible is the base axle....2.59 vs 2.73 as I recall.
Le Mans Master
Joined: Jan 2004
Posts: 7,276
Likes: 3
From: Why are there squished peanut butter cups in my underware?
Originally Posted by LT4BUD
G92 is 3.07 for both auto-verts & auto-coupes.
What varied between auto-coupe and auto-convertible is the base axle....2.59 vs 2.73 as I recall.
What varied between auto-coupe and auto-convertible is the base axle....2.59 vs 2.73 as I recall.
Le Mans Master
Joined: Jan 2004
Posts: 7,276
Likes: 3
From: Why are there squished peanut butter cups in my underware?
Originally Posted by LT4BUD
G92 is 3.07 for both auto-verts & auto-coupes.
What varied between auto-coupe and auto-convertible is the base axle....2.59 vs 2.73 as I recall.
What varied between auto-coupe and auto-convertible is the base axle....2.59 vs 2.73 as I recall.
Safety Car
Joined: Sep 2000
Posts: 3,524
Likes: 4
From: Hinckley Ohio
Originally Posted by Z-07 freak
survey says...X
G92=3.07 Cost $22.00 confirmed on several sites......
Standard ratio is really tough to find on the net...I still put my $ on 2.59 & 2.73
Drifting
Joined: May 2004
Posts: 1,747
Likes: 1
From: Port McNicoll Ontario
I don't know about your year but for my 87
The base for the convertible is 2.59 and the perf one is 2.73.
For the coupes the base is 2.73 and the perf is 3.07.
I got this information out of my manual.
for the 87 vert if the perf option is g92 the ratio is 2.73.
This is for an auto
Check your manual.
The base for the convertible is 2.59 and the perf one is 2.73.
For the coupes the base is 2.73 and the perf is 3.07.
I got this information out of my manual.
for the 87 vert if the perf option is g92 the ratio is 2.73.
This is for an auto
Check your manual.
Le Mans Master
Joined: Jan 2004
Posts: 7,276
Likes: 3
From: Why are there squished peanut butter cups in my underware?
Originally Posted by LT4BUD
G92=3.07 Cost $22.00 confirmed on several sites......Standard ratio is really tough to find on the net...I still put my $ on 2.59 & 2.73
Before you lose the prize $$$ to the Miller family, here's the rear axle info for the 1990 model year;
2.59 RPO-GM1 base auto coupe & conv
2.73 RPO-GU2 optional auto conv
3.07 RPO-G44 optional auto coupe
RPO-G92 optional "performance axle" for automatics
3.33 RPO-GT7 6-sp manual for L-98 engines coupe & conv
3.45 RPO-GM3 6-sp manual for LT-5 engines ZR-1 coupes
Le Mans Master
Joined: Jan 2004
Posts: 7,276
Likes: 3
From: Why are there squished peanut butter cups in my underware?
Originally Posted by wildman378
my convertible with g92 has the g44 3.07's it's a 95 though.
G92 is the code for an extra cost option. G92 must have an optional ratio.
For a `90 vert it is GU2 2.73, different than coupes
For a `95 vert it is G44 3.07, same as coupes
Standard for both years is GM1 2.59
Melting Slicks
Joined: Apr 2004
Posts: 3,287
Likes: 7
From: n/a SC
Originally Posted by Z-07 freak
That's correct.
G92 is the code for an extra cost option. G92 must have an optional ratio.
For a `90 vert it is GU2 2.73, different than coupes
For a `95 vert it is G44 3.07, same as coupes
Standard for both years is GM1 2.59
G92 is the code for an extra cost option. G92 must have an optional ratio.
For a `90 vert it is GU2 2.73, different than coupes
For a `95 vert it is G44 3.07, same as coupes
Standard for both years is GM1 2.59
GM makes some weird calls......