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gear ratios????

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Old Aug 16, 2007 | 12:59 AM
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Default gear ratios????

Does anyone one what gear ratio of a c6 automatic?? thanks for your help
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Old Aug 16, 2007 | 01:30 AM
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I assume you are talking about the differential ratio and not the transmission gear ratio's:

05 A4 automatic's came with either a 2.73 or a 3.15 ratio.

06 and 07 A6's both came with 2.56.

08 A6's come with either a 2.56 or a 2.73 performance ratio.
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Old Aug 16, 2007 | 01:54 AM
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Originally Posted by Silverspeed
05 A4 automatic's came with either a 2.73 or a 3.15 ratio.
My 05 A4 is 3.15. Would changing to a higher ratio, say 3.70s increase performance? If so is there a down side? Increased stress/wear on transmission?

(hope I'm not hijacking the thread)




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Old Aug 16, 2007 | 02:04 AM
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Originally Posted by keyplyr
My 05 A4 is 3.15. Would changing to a higher ratio, say 3.70s increase performance?
I would post this question over on the tech forum. DTE and other gear manufacturers post over there and would be able to better answer your questions.
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Old Aug 16, 2007 | 02:06 AM
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Thanks - will do!
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Old Aug 16, 2007 | 02:37 AM
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Originally Posted by keyplyr
My 05 A4 is 3.15. Would changing to a higher ratio, say 3.70s increase performance? If so is there a down side? Increased stress/wear on transmission?
Well, you're already turning 2,000 RPM at 70 MPH. If you went to a 3.73 or 3.90 rear ratio, you'd be burning more gas. The car would burn the tires more easily from a stop, of course. There'd be less stress on the transmission, but maybe more wear since it would have to spin faster to make the same speed.
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Old Aug 16, 2007 | 06:49 AM
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Originally Posted by Mr. Marin
Does anyone one what gear ratio of a c6 automatic?? thanks for your help
You didn't say what year.

The 2005 A4 had a 2.73 or an optional 3.15.
The 2006, 2007 A6 have a 2.56.
The 2008 A6 has a 2.56 or an optional 2.73
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