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rear end gears

This is a discussion on rear end gears within the Drivetrain forums, part of the LSx Technical Help Section category; my 01 z-car came stock with 3.42 gears in the rear... is that good or should i change them..lookin for ...

  1. #1
    Junior Member niterunnr's Avatar
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    rear end gears

    my 01 z-car came stock with 3.42 gears in the rear... is that good or should i change them..lookin for better fuel mileage.. or faster pickup, anyone have any suggestions as to which gears would be better or some pros and cons of a different ratio thanks

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    M6 King Hot Black Trans-Am's Avatar
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    Leave them stock and save for a 12 bolt or 9" with 4.10's. I'm guessing your M6.

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    Your dealership guy konigandy6's Avatar
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    Quote Originally Posted by niterunnr View Post
    my 01 z-car came stock with 3.42 gears in the rear... is that good or should i change them..lookin for better fuel mileage.. or faster pickup, anyone have any suggestions as to which gears would be better or some pros and cons of a different ratio thanks
    You can't have both.... Numerically higher ratio will give you better get up and go but will kill your mileage. 3.42 is a good medium....if you care about MPG's.

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    Junior Member niterunnr's Avatar
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    kewl thanks for the info not lookin to race this car just yet but dont want to run toe to toe with a beemer again on the interstate either thanks again

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    Junior Member niterunnr's Avatar
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    what would 3:73's do for me or something better for fuel mileage

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    3.73 will increase your RPM a little, not that much gain over your 3.42, and decrease your gas mileage some. If you want to change gears and make a significant change go with 4.10 (even less MPG). My advice is keep the 3.42 and don't worry about the import guys.

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    M6 King Hot Black Trans-Am's Avatar
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    If your that worried about fuel mileage get some juice and then you only kill your MPG's when you want to and you won't fear the imports any more.

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    Member BlueMagicSS's Avatar
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    Ok... first is it an a4 or m6?? second like a few others said... you won't get the best of both worlds... just not gonna happen... If you want gas mileage, stick with what you got. If you want the take off... and you have an a4 go with 3.73's if you have an m6 and want take off, go with 4.11's or 4.10's....

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    Junior Member niterunnr's Avatar
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    Quote Originally Posted by BlueMagic08 View Post
    Ok... first is it an a4 or m6?? second like a few others said... you won't get the best of both worlds... just not gonna happen... If you want gas mileage, stick with what you got. If you want the take off... and you have an a4 go with 3.73's if you have an m6 and want take off, go with 4.11's or 4.10's....
    it is a m6.... i was wanting to lower the rpms at 75-85 since most of the highway driving i will be doin is on the turnpike thanks]

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