G92 differences with G44 both 3.07 but "performance" ?
Thread Starter
Le Mans Master
Joined: May 2007
Posts: 8,448
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From: Valparaiso
G92 differences with G44 both 3.07 but "performance" ?
G92 differences with G44 both 3.07 but "performance" ?
What's the difference ?
GH0 Rear Axle, 3.54 Ratio
GM1 Rear Axle, 2.59 Ratio
GU2 Rear Axle, 2.73 Ratio
GW4 Rear Axle, 3.31 Ratio
G44 Rear Axle, 3.07 Ratio
G92 Rear Axle, Performance Ratio
What's the difference ?
GH0 Rear Axle, 3.54 Ratio
GM1 Rear Axle, 2.59 Ratio
GU2 Rear Axle, 2.73 Ratio
GW4 Rear Axle, 3.31 Ratio
G44 Rear Axle, 3.07 Ratio
G92 Rear Axle, Performance Ratio
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
RPO G92 simply means that the car has an optional "performance" axle ratio. The "performance ratio" itself varied between the years, whether or not the car had a manual or automatic tranny and was a coupe or convertible.
For example, my old 92 convertible had the G92 performance ratio, but for that particular car (convertible with an auto trans) the "performance ratio" was only the GU2 2.73 gearset. The standard ratio for that car would have been the GM1 2.59.
For example, my old 92 convertible had the G92 performance ratio, but for that particular car (convertible with an auto trans) the "performance ratio" was only the GU2 2.73 gearset. The standard ratio for that car would have been the GM1 2.59.
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
You can look thru each model year of C4's here and ckick on "Specifications" or "Production and Performance"
The current issue of the Corvette Black Book will have the same information.
The earlier C4's didn't always have a separate defined axle ratio. For example the 87 had a 3.07 ratio as standard with the manual tranny; there was no optional ratio available. My '87's build sheet shows that G44 axle ratio.
Only the cars with automatics could get the optional G92 Performance Ratio G92 which was the same G44 3.07 ratio that the 4-speed cars had. The standard ratio for automatic cars in 87 was the 2.73 (RPO GU2)
The current issue of the Corvette Black Book will have the same information.
The earlier C4's didn't always have a separate defined axle ratio. For example the 87 had a 3.07 ratio as standard with the manual tranny; there was no optional ratio available. My '87's build sheet shows that G44 axle ratio.
Only the cars with automatics could get the optional G92 Performance Ratio G92 which was the same G44 3.07 ratio that the 4-speed cars had. The standard ratio for automatic cars in 87 was the 2.73 (RPO GU2)
Last edited by c4cruiser; Oct 20, 2008 at 03:17 PM.
Burning Brakes
Joined: Jun 2000
Posts: 913
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From: Chatsworth, Ga.
G92, G44 options
The rear carriers are as follows:
1. D36: GM1 Rear Axle, 2.59 Ratio
GU2 Rear Axle, 2.73 Ratio Both of these are the "Dana 2 Series"
2. D36: G92 Performance Ratio
G44 3.07 "Dana Series 3 carrier", different then #1 above
3. D44: "Dana Series 4"
There is a difference in #1 and #2 above in carriers and gears.
1. D36: GM1 Rear Axle, 2.59 Ratio
GU2 Rear Axle, 2.73 Ratio Both of these are the "Dana 2 Series"
2. D36: G92 Performance Ratio
G44 3.07 "Dana Series 3 carrier", different then #1 above
3. D44: "Dana Series 4"
There is a difference in #1 and #2 above in carriers and gears.
