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Thread: 3.90's on a DD

  1. #1
    Member SKULLZ's Avatar
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    1999 Z28 Camaro

    3.90's on a DD

    I have seen a set of 3.90 gears for a 99 Z28. I was wondering how streetable it would be with a 3000 stall. I was planning on 3.73s until i saw these.

  2. #2
    Junior Member MNR-0's Avatar
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    2004 Monaro

    Very streetable - more so than 3.73. Very little diff. on the freeway between these 2 - but big diff in off-the-line response.

  3. #3
    Senior Member ninobrn99's Avatar
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    all bore 370 Trans Am

    if you have a stock 10 bolt, they dont make 3.90's for it. I have 3.89's in my 9" and they're not bad. its a m6 though.

  4. #4
    Member keliente's Avatar
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    99 Firebird Formula

    There are no 3.90s for a 10 bolt. I have them in my 12, though.

  5. #5
    Member SKULLZ's Avatar
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    1999 Z28 Camaro

    69-G875390 Motive Performance Gears, 3.90 Gear Ratio, 3 series carrier, GM 7.5" 10 bolt rear end

    this is what I saw on thunderracing.com, for a 98-2002 camaro/f-body


  6. #6
    The VCBoiz
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    Quote Originally Posted by SKULLZ
    69-G875390 Motive Performance Gears, 3.90 Gear Ratio, 3 series carrier, GM 7.5" 10 bolt rear end

    this is what I saw on thunderracing.com, for a 98-2002 camaro/f-body


    Holy crap this better be for real. It's on there website for sure. I'm calling them tomorrow.

  7. #7
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    Quote Originally Posted by MNR-0
    Very streetable - more so than 3.73. Very little diff. on the freeway between these 2 - but big diff in off-the-line response.
    so, 3.90 is better off of the line, and almost as good on the highway? Y do people get 3.73's?

    -sorry, i don't know anything

  8. #8
    Story of My Life!! BIG D's SS's Avatar
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    The 3.90s was suppose to be released this soring for a GM 10 bolt. I haven't looked but I know they are suppose to be out.

  9. #9
    Member keliente's Avatar
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    99 Firebird Formula

    I've been driving on them in my 12 for a week, it's a great compromise between 4.10 and 3.73.

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