how do I find out what gear ratio I have

02-07-2007, 08:34 PM

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how do I find out what gear ratio I have

I need to know what ratio I have. I have a 99 z28 a4

02-07-2007, 08:47 PM

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Most likely a 2.73. Look on your door panel for the option code:

GU3 = 2.73
GU5 = 3.23

02-08-2007, 06:54 AM

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Well if your at 2100 rpm @ 70mph you have 3.23's
If you at like 1800 rpm @70 then you have 2.73's
that easy enough