I have a 06 C6 with the (6) speed automatic transmission and I believe a 2:56 axle ratio. Does anyone know what the 0 - 60 mph and 1/4 mile times would be for this vehicle?

Would I see a major improvement in 0 - 60 mph and 1/4 mile times if I changed the axle ratio to 4:11? Would this be a wise thing to do? Would a 3:90 ratio be a better choice?

1/4 mile times for the auto are not any different than the M6 or A4's. They are pretty consistant across the board.
Showroom Stock
12.21 @ 115.45 - LS1LT1- 06 A6
12.23 @ 115.58 - 06C6FVR - 06 Z51 M6
12.31 @ 114.82 - CYA Vett - 05 F55 M6
12.42 @ 113.90 - DrRichie - 05 Z51 M6
12.42 @ 112.99 - Jlking - 06 A6
12.49 @ 114.90 - Jschindler - 05 Z51 M6
12.53 @ 113.00 - Wicked07C6 - 07 Z51 M6
12.54 @ 113.59 - Tony 63 Vette - 06 A6
12.54 @ 113.74 - Tony96LT4 - 06 Z51 A6
12.54 @ 113.24 - NineBall - 05 Z51 M6 - tstat
12.56 @ 113.39 - Red Sleeper -06 A6
12.56 @ 112.00 - Orange C6 - 05 Z51 A4
12.63 @ 114.88 - Prankster - 06 M6
12.65 @ 111.65 - Zippin Zee - 05 Z51 M6
12.66 @ 113.03 - Mdrrandall - 07 Z51 M6
12.69 @ 112.32 - Silverlx -06 A6
12.70 @ 112.43 - Jelsis - 06 Z51 A6
12.70 @ 113.00 - Blackmajik -07 A6
12.71 @ 111.30 - Flyin05 - 05 Z51 M6
12.71 @ 111.00 - Demented - 05 Z51 A4
12.72 @ 111.98 - SR0707 - 06 A6
12.72 @ 110.85 - AngeloC6 - 05 F55 A4 3.15 (open shroud)
12.74 @ 108.67 - Shooter 49 - 05 A4 3.15
12.75 @ 109.25 - Ponchorello -05 A4 3.15
12.76 @ 112.57 - C5Pilot - 07 Z51 A6
12.78 @ 115.14 - Prankster - 06 M6
12.79 @ 112.17 - Jchazr - 05 Z51 M6
12.80 @ 111.00 - SheDevilC6 - 07 Z51 A6
12.81 @ 112.83 - Vette-oholic - 05 Z51 M6
12.83 @ 109.44 - Tommy D - 05 A4 3.15
12.84 @ 112.98 - Proney - 06 M6
12.85 @ 114.53 - Mr Z51 - 06 Z51 M6
12.90 @ 114.83 - Normlunt - 05 Z51 M6 - tstat
12.93 @ 111.40 - DiggyMoe -07 M6
12.97 @ 108.00 - Ginny C6 - 05 F55 A4
12.98 @ 108.00 - Tampa Vet - 05 A4 3.15
12.99 @ 111.70 - C64ME - 05 Z51 M6
13.04 @ 109.15 - TMyers - 06 A6
13.05 @ 113.31 - RDunn - 06 M6
13.10 @ 108.70 - Rothchilds - 05 F55 A4 3.15
13.12 @ 110.40 - JDWK - 05 Z51 M6
13.25 @ 110.60 - C6 Matt - 05 Z51 M6
13.26 @ 108.59 - Sfadchi - 06 Z51 A6
13.26 @ 105.30 - Joeking - 05 Z51 A4
13.30 @ 107.00 - Shurite44 -06 Z51 A6
13.35 @ 108.10 - Phatpharmd - 06 A6
13.62 @ 106.18 - Rich28 - 05 Z51 A4

As far as rear gears, the A6 is geared so that I dont think changing is necessary. Hiway driving with such steep gears would be terrible. I would just get a higher stall converter.

THANKS!

Wow, low 12's. That's really impressive. Thanks for the comps.

Yes our A6 has a 2.56 rear axle. They are making the A4 axle (2.73) available for the Z51 option on the 2008 car. Like an earlier post, I sure wouldn't go for those axle ratios you listed.