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
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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
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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
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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
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Le Mans Master
Joined: Aug 2000
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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
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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
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From: Kempner Texas
1st Gear
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Team Owner
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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
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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
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Team Owner
Joined: Sep 2003
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There's many RPO deciphering apps out there and .pdf from many vendors including GM/ACD.
