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How can I find out my car's gearing?

This is a discussion on How can I find out my car's gearing? within the Automatic Transmission forums, part of the Drivetrain category; its a 2002 Z-28 with auto trans. Is it listed somewhere on the car?...

  1. #1
    Member Rich L's Avatar
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    Burgandy
    2002 Z28

    How can I find out my car's gearing?

    its a 2002 Z-28 with auto trans.

    Is it listed somewhere on the car?

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    Stock was either 2.73 (GU2) or 3.23 (GU5) on the Z28 A4 - check for the code on the driver's side door. Beware sometimes people change the gears, mine says GU2 but has 3.42's. If you suspect a possible change look at one of the calculators like www.f-body.org/gears/

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    Member Rich L's Avatar
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    Burgandy
    2002 Z28

    Thumbs up

    Thanks for the info.

    I found the GU5 code in the door... 3.25 gearing.

    Can I assume that my car would be a little quicker in the 1/4 mile compared to the the same car with 2.73 gearing?? (assuming everthing else would be equal)

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    Probably, but too many other factors involved, never equal. GM called 3.23's their "performance axle option" for the A4 and came with an aluminum vs. steel driveshaft (2.73) cars. I've seen a lot of stock 2.73 cars do very well at the track.

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    Member Rich L's Avatar
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    Burgandy
    2002 Z28

    Quote Originally Posted by 2001NBMZ28 View Post
    Stock was either 2.73 (GU2) or 3.23 (GU5) on the Z28 A4 - check for the code on the driver's side door. Beware sometimes people change the gears, mine says GU2 but has 3.42's. If you suspect a possible change look at one of the calculators like www.f-body.org/gears/
    Right now I have the stock 16" rims...

    If I upgraded to 17's doesnt that really change the "true" gearing?

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