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gear ratio ??

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Old Jan 16, 2011 | 09:31 AM
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Default gear ratio ??

Hello everone its me again,,, Trying to find out gear ratio... I got a 99 FRC 6 speed Oct. 2010, lots of mods already done ( bolt ons / chrome ect. ) in 5th gear 55mph approx. 1750 rpm, any info on this... Thanx..
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Old Jan 16, 2011 | 09:35 AM
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What are you asking?

The stock ratio for your car is 3.42:1
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Old Jan 16, 2011 | 09:53 AM
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Hi Capthuff, so the numbers I posted says the gears haven't been changed ???
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Old Jan 16, 2011 | 10:24 AM
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Theres a formula - it's somewhere in a thread in this section.

I believe it's 4th gear at 70mph. Your tach will tell you the gear ratio.

In other words, if you're spinning 3420rpm in 4th gear at 70mph, you would have stock gearing.

Search this section, you'll find it.
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Old Jan 16, 2011 | 10:27 AM
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Here is a previous post by Patche's. I'm most sure he wouldn't mind if we re posted it back up.

http://forums.corvetteforum.com/c5-t...-question.html
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Old Jan 16, 2011 | 10:55 AM
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Thanx Capthuff and Bumble-z for fast replies and info!!!!!
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Old Jan 16, 2011 | 02:20 PM
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It's 4th gear at 75 mph. If stock, you'll be running around 3420 rpms. Works for automatics in 3rd gear, too
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Old Jan 16, 2011 | 04:25 PM
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Thanx 65ggvert, not able to it today but will asap i'll have to get on I-40 to run it... thanx again...
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Old Jan 16, 2011 | 06:00 PM
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Originally Posted by 65GGvert
It's 4th gear at 75 mph. If stock, you'll be running around 3420 rpms. Works for automatics in 3rd gear, too
Never heard this before.....I will have to check it out
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Old Jan 16, 2011 | 08:40 PM
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Originally Posted by ALLEGRO
Never heard this before.....I will have to check it out
Just so there's no misunderstanding, if you have a 2:73, in 3rd gear you'll read 2730 rpm and if you have a 3:15, you'll read 3150 rpms with automatic at 75 mph.
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Old Jan 16, 2011 | 08:53 PM
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3.42 gear-4th 70 mph=3100rpm 3.90gear- 4th 70mph=3500 rpm. 4.10 gear- 4th 70 mph. =3700 rpm.
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Old Jan 16, 2011 | 11:18 PM
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Wow you all are on this tonite... Thanx a bunch everyone .... I bought my car with alot of mods done and was wondering if it was stock or upgraded rear... hope to get on I-40 to check this out...probably 342 gear,,,I'll find out later and post it .... thanx again!!!!!
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Old Jan 24, 2011 | 06:39 PM
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Finally got on I-40 today to check the gear ratio and its 3.42, the same gear in a old 79 T/A I had back in the 80's.... bet a 3.90 or 4.10 would put a bigger smile on my face!!!!! (LOL) Thanx again everyone!!!
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