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Which rear end?

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Old Aug 1, 2009 | 03:08 AM
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Default Which rear end?
I just bought my 2005 C6 with 29K on it.
It runs great. I owned a '97 C5 prior to this C6.
This C6 has the Z51 suspension and I would like to know what size rear end came in the A4.
I looked for the codes GU2=2.73 and G92= 3.15, but none of these are shown on the glove box sticker.
Did they have a different code for the C6?
Thanks
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Old Aug 2, 2009 | 03:00 PM
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for 2005 the Z51 came with 3.15
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Old Aug 2, 2009 | 10:18 PM
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what rear came in 06 a6 z51???
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Old Aug 2, 2009 | 11:40 PM
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Originally Posted by bearnest
what rear came in 06 a6 z51???
2.73
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Old Aug 3, 2009 | 01:02 AM
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Originally Posted by bearnest
what rear came in 06 a6 z51???
Originally Posted by Keith N
2.73
No, actually it was 2.56s.
The only rear axle ratio for 2006 & 2007 automatics was a 2.56.
The 2.73 option (standard on automatic Z51 cars) didn't become available until the 2008 model year.
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Old Aug 3, 2009 | 04:59 AM
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Originally Posted by lgm118icbm
for 2005 the Z51 came with 3.15
So I have a 3:15 in my 05 Z51. If so this is great news...
thanks...
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Old Aug 6, 2009 | 11:29 AM
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Default rear end ratio
why are auto trans rear end ratios lower than manual trans?
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Old Aug 6, 2009 | 02:35 PM
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Because they have to be fair to the stick guys... that way they wont get smoked too bad


Let the games begin
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Old Aug 6, 2009 | 03:01 PM
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Originally Posted by Slogo
why are auto trans rear end ratios lower than manual trans?
Typically because their gear ratios were steeper, so they could use a lower final drive ratio for fuel economy.
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Old Aug 7, 2009 | 08:15 AM
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Yes I agree with the others the 05 Z-51 has a 3:15 ratio rear end. It's a great combination for a quarter mile car thats for sure.
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Old Aug 7, 2009 | 11:01 AM
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What about the 05' MN6 Z51?
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Old Aug 7, 2009 | 02:00 PM
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Originally Posted by ALLBlackC6
What about the 05' MN6 Z51?
M6 cars have 3.42s.
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