C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

What gear ratio do i have?

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Old 03-27-2004, 11:34 AM
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Jay 86
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Default What gear ratio do i have?

how do i tell what gear ratio i have in my vette? It's an 86 automatic.
Old 03-27-2004, 11:39 AM
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CFI-EFI
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Default Re: What gear ratio do i have? (Jay 86)

Check your RPO list on the inside of the lid of one your rear storage compartments. Post ALL of the items starting with the letter, "G".

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Old 03-27-2004, 11:43 AM
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Cal Vette
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Default Re: What gear ratio do i have? (Jay 86)

Hope this is correct. GM1-2:59 GU2-2:73 G44—3:07 GHO-3:54
GM3-3:45 G92 3:73
:D


[Modified by Cal Vette, 10:44 AM 3/27/2004]
Old 03-27-2004, 11:58 AM
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Default Re: What gear ratio do i have? (Cal Vette)

G92 means "performance ratio". Since the standard ratio varies from year to year and car to car, so does the "performance ratio". That is why I asked for ALL the "G" codes. G92, alone, does NOT specify any given ratio. Additionally, I don't believe a 3.73 was ever offered by GM for a C4 Corvette

RACE ON!!!


[Modified by CFI-EFI, 10:01 AM 3/27/2004]
Old 03-27-2004, 01:44 PM
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vader86
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Default Re: What gear ratio do i have? (Jay 86)

If you have an 86 coupe, you can have either 2.59 or 3.07
The verts could get a 2.73.

If you have G44 or G92 you got the 3.07, also if you have Z51 in 86 the 3.07 is standard.
Old 03-27-2004, 03:53 PM
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1990CORVETTE
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Default Re: What gear ratio do i have? (Cal Vette)

Hope this is correct. G92 3:73
:D


[Modified by Cal Vette, 10:44 AM 3/27/2004]
:confused: :nonod: :nonod: :nonod: :nonod: :nonod:
Old 03-27-2004, 07:30 PM
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Default Re: What gear ratio do i have? (vader86)

If you have G44 or G92 you got the 3.07, also if you have Z51 in 86 the 3.07 is standard.
IF it has a G92, it will also have the "G" code designating the "actual" ratio.

RACE ON!!!


[Modified by CFI-EFI, 5:33 PM 3/27/2004]
Old 03-28-2004, 04:55 PM
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Jay 86
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Default Re: What gear ratio do i have? (Jay 86)

thanks for the information i will look and post back what i see.
Old 03-28-2004, 05:44 PM
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Jay 86
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Default Re: What gear ratio do i have? (Jay 86)

i looked in the list in the storage compartment and the only RPO number is saw was GM1. I guess this means i have a 2.59 rear gear.
Old 03-28-2004, 06:46 PM
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Default Re: What gear ratio do i have? (Jay 86)

Correct!
Old 03-28-2004, 10:40 PM
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Default Re: What gear ratio do i have? (Jay 86)

Dontcha wish that the cheap plick who ordered your car would have spent the extra $22 and got a G92? :mad The person who ordered my 87 vert was also too cheap to pay the extra $ :smash: You can get under the car and look at the right lower rear side of the differential carrier. Rub with a rag and some cleaner and you will see Dana Part# on top, GM Part# just below that, Ratio just below and to the left followed by Gear Tooth Comb., below that is the build date. Source: "101 Projects for your Corvette 1984 - 1996" by Richard Newton

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