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rear axle ratio

regalniz

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194
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vegas baby vegas
Corvette
94 Polo Green Convertible w/auto
ok. so i looked under my console and i see i have the performance axle ratio, G92. damned if i can find the actual ratio anywhere. my 91 was 3.07. is it the same?
 

Ken

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1987 Z51 Silver Coupe
Yep. ;)

It also appears as though 1994 was the first year to have the G92 option available without restriction.

_ken :w
 

regalniz

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Apr 8, 2002
Messages
194
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vegas baby vegas
Corvette
94 Polo Green Convertible w/auto
so how do i find out the actual ratio since chevy offered so many in 94. i can remember seeing tags on GM rear ends with the ratio stamped on.
 

Ken

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1987 Z51 Silver Coupe
I just looked in Mike Antonick's new book Cor- Vette Specs 1984-1996 and discover that although there is only one option code listed (G92), there are actually four different axles ratios that were available in 1994:
  • 2.59:1 ratio: 17 pinion teeth, 44 ring gear teeth, 7.875" ring gear outside diameter.
  • 3.07:1 ratio: 14 pinion teeth, 43 ring gear teeth, 7.875" ring gear outside diameter.
  • 3.33:1 ratio: 12 pinion teeth, 38 ring gear teeth, 8.5" ring gear outside diameter (manual trans).
  • 3.45:1 ratio: 11 pinion teeth, 44 ring gear teeth, 8.5" ring gear outside diameter (manual trans and ZR-1)

Learn something new every day, except what codes go along with those ratios. :L

_ken :w
 

Ken

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1987 Z51 Silver Coupe
:L I think I just answered my own question.

You didn't state if it was auto or manual trans, so if it's an auto, you've got 3.07:1 ratio as the perforrmance axle. If it's a manual, you have the 3.33:1 or the 3.45:1 ratio. ;)

_ken :w
 

regalniz

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Apr 8, 2002
Messages
194
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vegas baby vegas
Corvette
94 Polo Green Convertible w/auto
sorry. its an auto. thats what i needed to know. thanx dude. while i got your attention, i need headers. no shortys. i wanna keep it legal so they need to have all emissions (cough!) already in place.
 

Ken

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1987 Z51 Silver Coupe
Oh you'll get a lot of response to the header question alright; everybody's got one... A "preference" that is. ;)

Mine happens to be long tube headers, and the smog nazis be damned! :L

Shop around at places like Jeg's or Summit in addition to the usual "Corvette's only" places. You'll find something that suits your needs.

_ken :w
 
S

Shadowing1985v

Guest
do headers do much when u have a auto tranny then for what it does for a stick

someone told me it does


plus i was told headers are only good for 350 hp plus

whats your guy's opionions(man i can't spell)
 

Edmond

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Aug 1, 2001
Messages
5,218
Location
Louisiana
Corvette
2003 Z06
How in the world do I find out my gear ratio? I have a 88' 35th Anniversary coupe.

Thanks,
 

Ken

Gone but not forgotten
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Messages
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1987 Z51 Silver Coupe
Edmond, you've been around here long enough to have seen us talking about the code list that can be found under the rear compartment lid or the console lid, and the also codes found on your build sheet or window sticker. Your code, if you have the performance axle ratio, would be found in one of those places. ;)

_ken :w
 

Radar

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Joined
Oct 23, 2001
Messages
200
Location
Oconomowoc, WI
Corvette
1989 Medium Blue Metalic Convertible
I found out my axle ratio by reading the options card on the inside cover of the console lid. Then I looked the code up in my GM shop manual. The manual has a chart to decode the options code. My 89 vert with auto has the standard 2:59's.

Radar :)
 
Joined
Apr 18, 2002
Messages
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Location
Staten Island, NY
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1999 Torch Red Coupe
Regalniz

Shorty headers are really performance manifolds at best. If a 10 to 12 hp improvement is worth an over $300 investment to you that go for it.

Long tubes are the real deal, you can call the tech line of any large header manufacturer to verify (hooker, headman, SLP).


Good luck
 
C

Cigarman

Guest
Radar said:
I found out my axle ratio by reading the options card on the inside cover of the console lid. Then I looked the code up in my GM shop manual. The manual has a chart to decode the options code. My 89 vert with auto has the standard 2:59's.

Radar :)

My 6-speed '89 has a 3.54 rear end. Any '89 made before Feb has that rear, after that the standard was 3.33. If you wanted the 3.54 after Feb, you had to special order it--I had understood that more '89 cars have the 3.33.

The 3.54 is coded GH0.

Wnat is your car's birthday?
 

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