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12 bolt or 9"

This is a discussion on 12 bolt or 9" within the Drivetrain forums, part of the LSx Technical Help Section category; I'm sure this has been asked before, but I'm being too lazy to search. I know there are pros and ...

  1. #1
    Senior Member transamprincess98's Avatar
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    STS-V

    12 bolt or 9"

    I'm sure this has been asked before, but I'm being too lazy to search. I know there are pros and cons to both rears. I'm looking for opinions from people who have used either set up, what gears and how they liked the results.

  2. #2
    Slow'er'Ass Mr. Luos's Avatar
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    Red Tint Jewelcoat
    2008 Trailblazer SS

    M6 = 9"
    A4 = 12 bolt

  3. #3
    Wants to be Snowboarding FuhBreezeE's Avatar
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    Stg IV a4
    '99 TA Ws777

    My moser 12 bolt will arrive today, I have an A4 and ordered 3.73 gears. I hardly doubt anyone on here complains about their aftermarket rear end. Much better than the original.

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    Senior Member transamprincess98's Avatar
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    I have the A4, but keep hearing alot of negative feedback about the 12 bolts and whine. What are the cons of a 9" with an A4?

  5. #5
    Slow'er'Ass Mr. Luos's Avatar
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    Heavy. An A4 already 'eats' up power...no reason to eat more up with the 9".
    Rock solid though. Won't have to worry about it.

    I have a touch of whine in 4th gear with my 9". Not at WOT throttle though. Most of the time, if they are broken in correctly there isn't much of a problem.

  6. #6
    Wants to be Snowboarding FuhBreezeE's Avatar
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    Stg IV a4
    '99 TA Ws777

    Quote Originally Posted by Mr. Luos View Post
    Heavy. An A4 already 'eats' up power...no reason to eat more up with the 9".
    Rock solid though. Won't have to worry about it.

    I have a touch of whine in 4th gear with my 9". Not at WOT throttle though. Most of the time, if they are broken in correctly there isn't much of a problem.
    How does one break it in correctly?

  7. #7
    Slow'er'Ass Mr. Luos's Avatar
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    Follow the instructions.
    Each one is different.

    My 9" called for light driving for about 30 minutes. No synthetics. Let cool. Repeat light driving once. Let cool.
    Beat the piss outta it.

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