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3.91 Gears in GTO??

This is a discussion on 3.91 Gears in GTO?? within the Drivetrain forums, part of the LSx Technical Help Section category; Well I've done a ton of reading on the board here and while some guys will say 3.73 is a ...

  1. #1
    Junior Member CanadianGoat's Avatar
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    2005 GTO

    3.91 Gears in GTO??

    Well I've done a ton of reading on the board here and while some guys will say 3.73 is a better choice--the majority seem to go with 3.91

    Heres my setup:
    2005 GTO with an A4--3600 stall
    ported intake--stock heads and cam (224/224, .580/.580)
    LT headers.

    Its a DD that I drive 30 miles a day (half city and half highway).
    I also drive it to the track probably 6 or 7 times a year.
    I always run on R's and skinnies at the track and this year my best runs were:
    12.06 @ 113 mph with a 1.71 60 ft. I have 60 ft's in the 1.65 range on another day but the weather was hot so times were a bit slower.

    It runs throught the traps at arouund 5200 rpm currently.

    I am really leaning towards the 3.91 over anything else--just seems like it will work best for me but Id love to hear any opinions/comments.

    Bob

  2. #2
    Senior Member slims00ls1z28's Avatar
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    2005 GTO M6 Black
    2000 Z28 A4 Red

    Go deeper. You'll wish you hadn't if you don't. My GTO's stock but I have 4.11's on the z with the 3600 stall and never looked back.

  3. #3
    Old Member, New Username BrownsMillsAntz's Avatar
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    1995 Z28 w/ LS1 Swap

    Quote Originally Posted by slims00ls1z28 View Post
    Go deeper. You'll wish you hadn't if you don't. My GTO's stock but I have 4.11's on the z with the 3600 stall and never looked back.
    411's w/ a 3600 stalled LS1 Fbody? Im curious, hows the street manners and powerband?

    Heads/Cam/Intake/Stall.
    404 Rwhp uncorrected @ 6400

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