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9" vs 12 bolt

This is a discussion on 9" vs 12 bolt within the Drivetrain forums, part of the LSx Technical Help Section category; Alright opinion time people moser 12 bolt vs moser Fbody 9"? which you perfer supported by fact if possible. durability, ...

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    Junior Member slpws6ta's Avatar
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    9" vs 12 bolt

    Alright opinion time people moser 12 bolt vs moser Fbody 9"? which you perfer supported by fact if possible. durability, drivability, best fit any real fact based opinions would be appreciated. im afraid my 10 bolt isnt going to last long with the way im using it.

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    Senior Member bills98ta's Avatar
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    I have the moser, but I figure which ever one you can get a great deal on ! They're both pretty much bullit proof !!!

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    Junior Member slpws6ta's Avatar
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    Quote Originally Posted by bills98ta View Post
    I have the moser, but I figure which ever one you can get a great deal on ! They're both pretty much bullit proof !!!
    Moser makes both you have a moser 9" or 12 bolt?

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    Senior Member bills98ta's Avatar
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    Quote Originally Posted by slpws6ta View Post
    Moser makes both you have a moser 9" or 12 bolt?
    12 bolt, spool, 4.10 gear... Sure beats rebuilding the stock 7.5 rear all the time !

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    Senior Member bills98ta's Avatar
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    What stall do you have ?

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    Junior Member slpws6ta's Avatar
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    LOL it only stalls if i dont rev it high enough before i come off the clutch! Lol it's a 6 speed and i'm running 26x11.5r17 mickey thompsons which is why i'm researching rear end upgrades!
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    Senior Member bills98ta's Avatar
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    Pretty Good Launch then !!! I tried the six speed thing once... I'm better with the A-4 !!! LOL

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    Senior Member Rhinohuey's Avatar
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    General rule I believe is 9" for M6 and 12-bolt for A4. Can't tell you why but thats what Ive heard.

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    Member zmg00camaross's Avatar
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    9 inch for m6 and gear changes are a snap

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    Junior Member slpws6ta's Avatar
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    Quote Originally Posted by bills98ta View Post
    Pretty Good Launch then !!! I tried the six speed thing once... I'm better with the A-4 !!! LOL
    thanks it actually pulls the left front a good 6 inches and the right front about 1-2 but the picture was a taken just a little late. that was sunday1/11/09 i made 6 passes and pulled the front 4 times friday night i went to an 1/8 mile track to work on my 60' and made 10 passes pulled the front 9 times and note a peep or growl or anything from the stock 85,000 mile 3.42 rear end, i love my car... i'd love it a little more if she'd run 10's lol

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    Junior Member slpws6ta's Avatar
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    Quote Originally Posted by Rhinohuey View Post
    General rule I believe is 9" for M6 and 12-bolt for A4. Can't tell you why but thats what Ive heard.
    thanks i appreciate the info but without reason i may as well flip a coin.

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    Junior Member slpws6ta's Avatar
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    Quote Originally Posted by zmg00camaross View Post
    9 inch for m6 and gear changes are a snap
    yea a quick gear change would be nice but center sections are damn expensive, however i think i'm leaning 9" but 12 bolts are pretty nasty too!

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    Senior Member bills98ta's Avatar
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    Once you get air ( under the tires ), you always want more !!! You must be getting a good 60' then. I average 1.39-1.41...

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    Junior Member slpws6ta's Avatar
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    my best is 1.8 but its untuned so it kind of falls on its face as soon as the tires come down. but your are right I WANT MORE!!!!!!

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    Senior Member bills98ta's Avatar
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    Has the rear went yet ?
    Mine blew 4 times, before I upgraded... I went from a 3600 to a 4600 stall, didn't get one whole launch that time... Plus it took the tranny with it...

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    Senior Member Bottesini's Avatar
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    Quote Originally Posted by Rhinohuey View Post
    General rule I believe is 9" for M6 and 12-bolt for A4. Can't tell you why but thats what Ive heard.
    It is because the torque arm mount tends to flex the housing for the 12 bolts which leads to gear noise. Autos tend to be nicer to rears as well. Personally, I went with the 9" and love it. Not to mention I will not be worrying about it breaking anytime soon.

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    King 0f n00bz shady milkman's Avatar
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    12 bolts have been known to break with modded m6s..more on the heavier side...the reason why 9"s are recommended for m6s are becuase they are built proof ..with their gear size..good contact patch..so you dont get deflection which causes gernading(10,and 12s)..also a4s preload the drivetrain before the launch..so its not such violent shock to the drivetrain(thats why 12s are perfect for a4s..very hard to break one) but for m6s..its no preload so drivetrain shock is exponentially higher then with a4s...so more flex and stress...go 9" even though i am an a4..i will be going midwest chasis fabbed 9" down the road..i like the set up and love the fact that i will probably never break that rear end unless i somehow get 2000hp/tq

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    Rice Killa JwMonE99's Avatar
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    I want a rear to handle 600 or 700 hp with M6 I dont need builit proof.

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    Junior Member slpws6ta's Avatar
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    no therear hasnt broke yet... but i know its coming but my mind is made up
    9" it is thanks for the input

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    2 SS's are better than 1 Jays00ss's Avatar
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    9" without a doubt
    2000 SS Camaro Heads, Large cam, Fast 90, 9"w/430's and locker, yada yada yada... you get the picture

    1971 SS ElCamino 402 Big Block 550HP

    2006 Silverado 2500HD 496 cubic inches of pure muscle

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