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gto rear end

This is a discussion on gto rear end within the Drivetrain forums, part of the LSx Technical Help Section category; What rpms should I be at if I have a stock rear end? Here's some pics I took. Thanks guys!...

  1. #1
    Junior Member
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    Impulse Blue Metallic
    2004 GTO

    gto rear end

    What rpms should I be at if I have a stock rear end? Here's some pics I took.
    Thanks guys!
    Attached Images Attached Images

  2. #2
    Junior Member
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    Impulse Blue Metallic
    2004 GTO

    Btw Its an 04 a4

  3. #3
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    yellow
    2004 pontiac gto

    has to be! my 04 m6 at 70 is at 1800 rpm. 80 at a little over 2000rpm.

  4. #4
    Moderator 35th-ANV-SS's Avatar
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    Red
    02 35th LE Camaro SS

    There are online calculators to tell you what RPM you should be at based on speed, tire size, and your transmission ratio.

    A 2004 GTO A4 has the following transmission ratios:
    1st gear - 3.06:1
    2nd gear - 1.63:1
    3rd gear - 1.00:1
    4th gear - 0.70:1

    Stock rear end ratio for the 04 GTO was 3.46

    I don't know what tire size you are running so I cannot calculate it for you. However, stock tire size for your car is a 275/45-17. If you are running this tire size, your car should be right at 2135RPM at 70MPH.

    Hope that helps.

  5. #5
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    yellow
    2004 pontiac gto

    245/45/17 on the 04's. i own one and thats what came on it. and all the others i have looked at. the 275 wouldn't make any difference. just a little wider. i ran 275's on mine and had to use spacers and do a inner fender tuck also, or they would rub. and that was with the stock 04 gto wheels.

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