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1990 rear end gear

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Old Jan 12, 2009 | 11:45 PM
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Alex Annapolis's Avatar
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Default 1990 rear end gear
Hey guys. Just bought a 1990 vette, and just starting to get informed. My brother just so happened to have a car and driver from 1990 and 91. Apparently in 1990 they used a shorter rear end gear and it hurt the performance of the car and even limited the top speed, then when back to a taller gear in 91. Any of you heard of this? Is the gear used in 91 a good all around ratio for perfomace and daily use, or would you recommend something else
thanks
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Old Jan 13, 2009 | 01:14 AM
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these are the gears in a 84-91 and the code will tell you what you have. no change based on year just rpo build
auto 2.59, 2.73,3.07 3.07 "performance gear"
stick 3.07 84-88 4+3 trans
stick ??? 89 + 6speed trans
maybe 3.31, 3.42. 3.45. 3.54 I (think) those are some of the gears, again your vin or your code will tell you

sorry for not being more descriptive.
Last edited by pologreen1; Jan 13, 2009 at 01:52 PM.
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Old Jan 13, 2009 | 01:22 AM
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As far as I am aware
all C4 A4 got 2.59 with 3.07 as the "performance " option.
Verts were 2.73
4+3 had 3.07
ZF6 came with 3.45 or 3.54
In some early cars there are 3.31
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Old Jan 13, 2009 | 08:50 AM
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90 6 speed RPO code GT7 is a 3.33

RPO codes are on a sticker on the under side of the center arm rest lid.
Last edited by Churchkey; Jan 13, 2009 at 08:53 AM.
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Old Jan 13, 2009 | 11:54 AM
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Originally Posted by Churchkey
90 6 speed RPO code GT7 is a 3.33

RPO codes are on a sticker on the under side of the center arm rest lid.
Well I think you have a rare bird here
p.s. this car came with 2.59's

never mind, was not thinking clearly, a real good chance in a 90 6 speed you got lower gears LOL duh!
Last edited by pologreen1; Jan 13, 2009 at 01:54 PM.
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Old Jan 13, 2009 | 12:55 PM
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Originally Posted by pologreen1
Well I think you have a rare bird here
p.s. this car came with 2.59's
i also have a 3.33 in mine and its build on my 20th birthday:



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Old Jan 13, 2009 | 01:34 PM
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Originally Posted by j-stingray
i also have a 3.33 in mine and its build on my 20th birthday:



very cool, I really did'nt think there can be many of that combo around for 90, but I guess since it is a 6 speed trans!
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Old Jan 13, 2009 | 01:36 PM
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yeah I have a 90 and my buddy has a 90 and both have 3.33, both are 6 speeds.

I dont have any idea where these other gear ratios are comming from
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Old Jan 13, 2009 | 01:37 PM
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Originally Posted by pologreen1
Well I think you have a rare bird here
p.s. this car came with 2.59's
Is your car an auto?
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Old Jan 13, 2009 | 01:55 PM
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My 90 auto has the 3.07
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Old Jan 13, 2009 | 01:56 PM
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Originally Posted by bill mcdonald
Is your car an auto?
LOL yeah I fixed it, I was not thinking straight, here, and mine is an auto, his is not
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