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Thread: 3.90's?

  1. #1
    Junior Member
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    Default 3.90's?

    Is anyone running 3.90's in their G8? I installed some in my buddies Caprice and it really woke it up. We had a rod let go before we were able to take it to the track. Now were going built 6.0 with a LSA, I will be installing a camaro LSD with 3.27 gears. Im thinking of putting the carrier with 3.90's in my cam, stall G8 and running some 28" slicks. But im thinking it might be too much gear. Any input is appreciated.

  2. #2
    Member yutzybrian's Avatar
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    3.91s are gonna be too much unless you just want an 1/8 mile car. They're better suited in the stick shifts like mine (our factory is 3.70). I'd go with 3.45 in yours.

    2009.5 G8 GXP SRM 6MT
    -Kooks 1-7/8 LT, 3" Solo, RotoFab CAI, Full Zeta II suspension with BCs, 3.91 1LE diff, Monster LT1-S & Tick Master Cylinder

  3. #3
    Beyond Help tchr49's Avatar
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    ^^^^^
    What he said
    things are not what they appear to be.....

    2009.5 Liquid Red,Onyx Red, Premium Package, e85 Surprise Package

  4. #4
    Senior Member Featherburner's Avatar
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    GPI has had much success with 3.91 gears in NA auto 5th gens. If you are trapping 130mph or less with an NA cammed car you are fine as you'll cross the line still in 4th gear.
    John
    2009 Stryker Blue Metalic GT Bolt-on G8 Record holder: 11.828 @ 114.61 with a 1.603 60'
    1993 Pontiac Formula FIREHAWK 385ci., M6, Strange S60.
    1968 Firebird Formula Convertible *Restomod project*

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