Performance axels on my '84?
Race Director
Joined: Apr 2003
Posts: 17,700
Likes: 1,667
From: moraga ca
The AXLES (halfshafts) were all the same. There was a performance rearend ratio of 3.31 to 1. Standard was 3.07. Rotate the rear tires one full revolution and count the number of times the driveshaft rotates. That will be the rearend ratio.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
G92 is the GM RPO code for the fitting of a optional
"Rear axle performance ratio "; not the ratio itself
The other "G" code on the label identifies the actual ratio.
GW4 is 3.31
'85+ autos with the G92 option got 3.07 gears;
RPO G44
"Rear axle performance ratio "; not the ratio itself
The other "G" code on the label identifies the actual ratio.
GW4 is 3.31
'85+ autos with the G92 option got 3.07 gears;
RPO G44
Drifting
Joined: Nov 2009
Posts: 1,341
Likes: 2
From: Perth Western Australia
St. Jude Donor '10
I have an 84 too and would also like to know where to find that. Haven't seen it yet.
If you want to know the final ratio just let me know what your rpms are cruising at 60 mph in top gear and I will calculate it for you.
If you want to know the final ratio just let me know what your rpms are cruising at 60 mph in top gear and I will calculate it for you.
Burning Brakes
Joined: Sep 2004
Posts: 1,130
Likes: 19
From: Arkansas
Le Mans Master
Joined: Nov 2009
Posts: 6,882
Likes: 235
From: Bangkok, Thailand
That explains that! Mine has the later style door handles and had the RPO codes in the storage space behind the driver.
BTW, I love the early style handles!
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
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
Le Mans Master
Joined: May 2006
Posts: 9,226
Likes: 9
From: Irvine Ca
If you want to find out what rear end you have, crawl under there and look on the housing....
No before some wise guy tells us that there is no way to verify that the gears weren't already changed/modified........Let's assume the rear end is not molested.
The gear ratio will be etched or stamped on the outside of the housing.
No before some wise guy tells us that there is no way to verify that the gears weren't already changed/modified........Let's assume the rear end is not molested.
The gear ratio will be etched or stamped on the outside of the housing.
Burning Brakes
Joined: Sep 2004
Posts: 1,130
Likes: 19
From: Arkansas
Rubber seals from inner fenders to hood also extended about 3 inches back on the front fenders.
Back in 1988 my brother had a very late 84 and I had an early one. It was fun seeing the production changes that were made.
Melting Slicks
Joined: May 2009
Posts: 2,782
Likes: 190
From: Decatur IL
2025 C4 of the Year Finalist - Unmodified
2022 C4 of the Year Finalist - Unmodified
All Z51s came with the performance axles. Half of the Corvettes made in 1984 were Z51 equipped. The driveshafts as well as the halfshafts on the Zs were aluminum. The ones in the base suspensions were steel.
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
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Melting Slicks
Joined: May 2009
Posts: 2,782
Likes: 190
From: Decatur IL
2025 C4 of the Year Finalist - Unmodified
2022 C4 of the Year Finalist - Unmodified
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
That is not what the production figures show.
Only 410 out of 51,500 '84 buyers selected the OPTIONAL G92 ratio.The rest got the base ratio
If a car has "options" then it is no longer a base car is it?
Base being defined as the bare minimum a car comes from the factory with ; no option boxes ticked
Base rearend ratio for '90 auto was 2.59
RPO G92 got the 3.07 you have in yours
Only 410 out of 51,500 '84 buyers selected the OPTIONAL G92 ratio.The rest got the base ratio
If a car has "options" then it is no longer a base car is it?
Base being defined as the bare minimum a car comes from the factory with ; no option boxes ticked
Base rearend ratio for '90 auto was 2.59
RPO G92 got the 3.07 you have in yours
Burning Brakes
Joined: Sep 2004
Posts: 1,130
Likes: 19
From: Arkansas
That is not what the production figures show.
Only 410 out of 51,500 '84 buyers selected the OPTIONAL G92 ratio.The rest got the base ratio
If a car has "options" then it is no longer a base car is it?
Base being defined as the bare minimum a car comes from the factory with ; no option boxes ticked
Base rearend ratio for '90 auto was 2.59
RPO G92 got the 3.07 you have in yours
Only 410 out of 51,500 '84 buyers selected the OPTIONAL G92 ratio.The rest got the base ratio
If a car has "options" then it is no longer a base car is it?
Base being defined as the bare minimum a car comes from the factory with ; no option boxes ticked
Base rearend ratio for '90 auto was 2.59
RPO G92 got the 3.07 you have in yours
