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which is the best, what is the diff?

This is a discussion on which is the best, what is the diff? within the Drivetrain forums, part of the LSx Technical Help Section category; which is best moser 12, or 9? What is the biggest diff?...

  1. #1
    Junior Member hutcher04's Avatar
    Join Date
    Mar 2008
    Indianapolis, Indiana

    black with silver
    2001 pontiac trans am ws6

    which is the best, what is the diff?

    which is best moser 12, or 9? What is the biggest diff?

  2. #2
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Mansfield, PA

    Black & Blue
    '02 WS.6 / '07 Suburban

    Best in what way?

    Strength - 9".

    Efficiency - 12 bolt.

  3. #3
    Exalted Cyclops 67CamaroRSSS's Avatar
    Join Date
    Feb 2007
    San Diego, CA

    2002 Z28 A4 NBM
    Sadly now demodded :(

    Size: 12-bolt = 8.875" diameter ring gear; 9" = 9" ring gear.

    IIRC, the 9" has a bigger pinion bearing diameter.

  4. #4
    Moderator 35th-ANV-SS's Avatar
    Join Date
    Oct 2008
    Wherever life takes me

    02 35th LE Camaro SS

    Read this article, it sums it up nicely.

  5. #5
    Member Supershafts's Avatar
    Join Date
    Apr 2010
    Long Island, N.Y.
    1971, 73,78, 85,92,95,

    12 bolt....the 9" is not stronger, except for it's amount of pin to gear contact...

    The pin is to low on the ring, making more drag and leverage on the ring to twist it, along with the pin bearings being to close together.... (THE reason it NEEDS the third bearing) Something no one talks about...

    Ever seen a 12 bolt shoot a pinion gear out and take the driveshaft with it ?

    How many times have you seen a 9" shoot the pinion gear out and take the driveshaft with it ?

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