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Old Dec 20, 2004 | 05:25 PM
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Default 3.90 gears

how much are gears and the labor to put them in a C5? where can i find them?
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Old Dec 20, 2004 | 05:31 PM
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contact DTE
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Old Dec 20, 2004 | 05:51 PM
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wow, $1600 for a gear upgrade is insane.......in my supercharged cobra it's only $500 to upgrade the gears
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Old Dec 20, 2004 | 05:55 PM
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Old Dec 20, 2004 | 06:00 PM
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Originally Posted by C5Generl
wow, $1600 for a gear upgrade is insane.......in my supercharged cobra it's only $500 to upgrade the gears
Welcome to the world of Corvette mods. If the gear upgrade was as cheap in my C5 as it was in my '99 Camaro, it would already have 3.90s.
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Old Dec 20, 2004 | 06:53 PM
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how much are the gear set's by themselves?
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Old Dec 20, 2004 | 07:03 PM
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Originally Posted by WikdC5
how much are the gear set's by themselves?
I paid $350.00 for my 3.73 ring and pinion. I then paid $200.00 to install them in a carrier that I had. It then cost me $400.00 to install the carrier in my car, grand total was $950.00.
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Old Dec 20, 2004 | 07:07 PM
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Originally Posted by C5Generl
wow, $1600 for a gear upgrade is insane.......in my supercharged cobra it's only $500 to upgrade the gears
Welcome to what's known as "The Corvette Tax"!
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Old Dec 20, 2004 | 07:19 PM
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I am thinking of changing to 3.73 or 3.90s What was the RPM differents and MPG? Have you ran 1/4 yet?
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Old Dec 20, 2004 | 07:22 PM
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in my supercharged cobra it's only $500 to upgrade the gears
sure... but who cares???

It's not insane. The Corvette is a completely different design - utilizing a rear transaxle. Comparing that to a Mustang is comparing apples to oranges.
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Old Dec 21, 2004 | 07:22 AM
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if ya cant pay, ya cant play.
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Old Dec 21, 2004 | 08:42 AM
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Originally Posted by jhart1
I am thinking of changing to 3.73 or 3.90s What was the RPM differents and MPG? Have you ran 1/4 yet?
Difference between the two, both RPM and MPG (highway) should be about 5%. The larger gear might even "help" MPG a little around town, depending on your converter (i.e. not as large penalty for a looser converter) though it'll never be like the OE configuration. I'm planning on a driveline rebuild soon and am toying with the idea of swapping my 3.73s for 3.90s. If I wasn't going to have everything apart anyway I wouldn't seriously consider it though...
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Old Dec 21, 2004 | 08:47 AM
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Originally Posted by jhart1
I am thinking of changing to 3.73 or 3.90s What was the RPM differents and MPG? Have you ran 1/4 yet?
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Old Dec 21, 2004 | 09:01 AM
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It is not a Corvette tax. I have thousands of dollars in just setup tools for just the C5/C6 differetials. We sell them for $1295 and it takes at least a day to go from start to finish on one. We replace all bearings, seals, clutches, and of course the ring and pinion. That is 8 hours in just the labor, not to mention the parts. Each clutch pack is over $100 the bearing are 100+ and you guys know what the Ring and Pinion sells for. The reason you cannot compare this to a Mustang besides the obvious is also numbers. There are a million + stangs out there where I don't know half a million get gears so they can sell them cheaper because they sell more. Now the the C5/C6 it is in the hundreds and the tooling for making these has to be spread out over the parts. I think it is pretty simple to understand when you look at it like that.
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Old Dec 21, 2004 | 10:48 AM
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Originally Posted by Mitch C
I paid $350.00 for my 3.73 ring and pinion. I then paid $200.00 to install them in a carrier that I had. It then cost me $400.00 to install the carrier in my car, grand total was $950.00.
I just picked up a set of 4.10s on Ebay brand new last night for 249.95 + $16 on the shipping. A local place (where pretty much every Vette shop in Houston brings their gear work) will do the install for $250 if I bring them the box. By doing the work yourself you can save a lot of money. By taking the box out myself I will be able to buy both HD output shafts.

Last edited by Cajundude; Dec 21, 2004 at 10:50 AM.
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Old Dec 21, 2004 | 07:43 PM
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Thanks thunder7! I think 3:90 is what I am looking for.
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