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Old 02-25-2003, 10:01 AM   #1
8686corvette
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Default Gear Ratio for 86 corvette coupe

Hello everyone,

I am new to the Corvette Forum. My brother has been a member for some time. I have an 86 corvette and he has a 70 Vett. I was wondering how to I find out what my Gear Rotio is in the rear end. I think he said he has 3.09 and my Vett is so much faster than his. Anyone got a clue?

Thanks :auto:
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Old 02-25-2003, 10:17 AM   #2
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Default Re: Gear Ratio for 86 corvette coupe (8686corvette)

I think the ratio is 3.07 gears. I know mine is and I also have a '86 coupe. There is a way you can get some what close. Jack up or lift the car so the rear wheels are off the ground. Put the car in neutral and turn the rear wheel and count the number of times the drive shaft turns to make one complete rotation of the rear wheel. A guy I work with told me about this trick. It would probably be a good idea to mark the drive shaft first. If the rear is stock, I think it is 3.07.


[Modified by 86VETTEMAN, 3:18 PM 2/25/2003]
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Old 02-25-2003, 10:20 AM   #3
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Default Re: Gear Ratio for 86 corvette coupe (8686corvette)

Check this thread. Had some good info concerning gear ratios and some links also

http://forums.corvetteforum.com/zerothread?id=493492

And, welcome to the forum...
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Old 02-25-2003, 10:26 AM   #4
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Default Re: Gear Ratio for 86 corvette coupe (86VETTEMAN)

My brother went to the track and ran low 15's in the quarter so he keeps telling me that my Gear Ratios must be much higher. We have raced in the past, and it was ugly for him :steering:
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Old 02-25-2003, 12:47 PM   #5
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Default Re: Gear Ratio for 86 corvette coupe (jimswhite92)

If you know the gears are original you can tell from the RPO codes located in the panel behind the passenger seat.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


[Modified by castivers, 12:49 PM 2/25/2003]
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Old 02-25-2003, 12:49 PM   #6
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Default Re: Gear Ratio for 86 corvette coupe (castivers)

Auto or 4+3?
Do you have the Z51 option (underneath the drivers' side compartment).

Available options were 2.59 and 3.07, its likely you have 3.07. I have it on my 86.
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Old 02-25-2003, 12:50 PM   #7
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Default Re: Gear Ratio for 86 corvette coupe (castivers)

What code am I looking for and once I find it, where do I find out what the code means? :confused: :auto:
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Old 02-25-2003, 12:52 PM   #8
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Default Re: Gear Ratio for 86 corvette coupe (8686corvette)

Any codes that start with G, G92, GM1, G44, etc.

And post them here, we'll tell you what they are.
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Old 02-25-2003, 02:00 PM   #9
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Default Re: Gear Ratio for 86 corvette coupe (vader86)

Here they are:
AG9,AU#,A42,A51,BGR,CC3,C49,C60,DL8,DX3, D9B,E5Z,E9Z,FG3,G44,G92,KB2,K34,K68,L98, MD8,MXO,NA5,QZD,UQ4,UU8,V01,V73,Z6A,1AY, 24S,731,732,81U

What all that means, no clue? :confused: :auto:
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Old 02-25-2003, 02:03 PM   #10
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Default Re: Gear Ratio for 86 corvette coupe (8686corvette)

hmm, looks like you have 3:07's fom the codes...
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Old 02-25-2003, 02:04 PM   #11
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Default Re: Gear Ratio for 86 corvette coupe (castivers)

Doesn't mean much, but the codes were behind the drivers seat. Thought I would let you know.

Thanks, :steering:
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Old 02-25-2003, 02:13 PM   #12
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Default Re: Gear Ratio for 86 corvette coupe (8686corvette)

Quote:
Here they are:
AG9,AU#,A42,A51,BGR,CC3,C49,C60,DL8,DX3, D9B,E5Z,E9Z,FG3,G44,G92,KB2,K34,K68,L98, MD8,MXO,NA5,QZD,UQ4,UU8,V01,V73,Z6A,1AY, 24S,731,732,81U

What all that means, no clue? :confused: :auto:
AG9-power driver seat
AU3-power door locks
A42-adjuster seat 6-way power bench
BGR-bowling green assembly
CC3-removable roof panels
C49-electronic rear defogger
C68-electronic A/C
DL8-heated mirrors
D3X-gear speedo driven
D98-stripe accent
E52-82in wrap around hatch
E98-rear hatch
G44-rear 3.07 ratio Dana 36, G92 performance ratio (means same thing for you)
KB2-cast iron heads
KC4-oil cooler
K34-cruise control
K68-105 amp alternator
L98-engine
MD8-700R4 transmission
MX0-auto w/ overdrive
NAS-emission federal
QZD-255/50 VR16 radials
UQ4-4 speaker system
UU8-Bose system
V01-heavy duty radiator
V23-vehicle certification
1AY-order modification stock processing
Z6A-rear/side defoggers
731-flame red interior
732-flame red interior

are the ones i know
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Old 02-25-2003, 02:19 PM   #13
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Default Re: Gear Ratio for 86 corvette coupe (vader86)

That looks like most of them. I really want to thank you for all your help. I hope to get a picture of my Vette posted once my brother shows me how.

Thanks!!!!! :cheers:
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Old 02-25-2003, 02:28 PM   #14
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Default Re: Gear Ratio for 86 corvette coupe (8686corvette)

Try this link - good info

http://www.corvetteactioncenter.com/...86/86prod.html
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Old 09-17-2013, 04:37 PM   #15
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i looked on the back of my seat and couldnt find them were else might i look
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Old 09-17-2013, 04:49 PM   #16
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Quote:
Originally Posted by Benjikittens View Post
i looked on the back of my seat and couldnt find them were else might i look
You've found yourself a 126 month old thread that started out as an axle ratio request. What are you looking for? You don't mention the year of your car. What year is it?

If you're looking for the SPID label, or RPO option label (call it what you like) it's location varies by year. None were on the back of the seat.

If it's an '84 or '85 it's on the storage compartment frame behind the driver. Not on the lid but stuck to the floor portion of the compartment frame.

'86 and later it would be on the back-side of the center console door.

If you don't find it in those two locations you won't find it. What sort of information are you looking for? You can purchase a build sheet by VIN from the NCM that would supply all of the information you're likely looking for.
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Old 09-18-2013, 01:55 AM   #17
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Open the compartment lid behind the driver's seat. That's where mine is. Early '86.
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Old 09-18-2013, 01:55 AM
 
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