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Thread: GM 12 bolt

  1. #1
    Senior Member DYNO OPERATOR
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    GM 12 bolt

    dose anyone know the power limits on a narrowed,ladder bar,spool 4.56 richmond race gear with strange axles,12 bolt rear end?
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  2. #2
    Senior Member DYNO OPERATOR
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    I ran an 86 cutlass at 2835# Big chevy powered, that had a 4 link and a 12 bolt with billet caps, studs, Mark williams moly spool with pro gears and an aluminum cover pre loader type that I ran 8.41 ET at 164 MPH for over 600 passes, replacing the gears every 200 passes no matter what they looked like. The new owner runs less power and will likely never have a problem with it running 9.80ET mouse power. I would not try to go a lot faster with a bunch more power and expect to run this long with out trouble. I think that a ladder bar suspension tries to bend the axle tubes more than a 4 link does, but do not have first hand exp. going faster than 8.5s with ladder bars at any weight.
    Hope this gives you a measuring stick to go by.
    Bruce

  3. #3
    Senior Member DYNO OPERATOR
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    I'm only going from a 360 running 10.9 to a 406 running ?.same cyl heads,cam,ect....So i'm not going to worry about the rear.

    Can't see it running in the 9's

    Thanks
    Terrance
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  4. #4
    Senior Member RACING JUNKIE
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    Quote Originally Posted by montecarlo84
    I'm only going from a 360 running 10.9 to a 406 running ?.same cyl heads,cam,ect....So i'm not going to worry about the rear.

    Can't see it running in the 9's

    Thanks
    Terrance
    you're fine ...I have a 540 in a 3200 lb Nova with a 12 bolt with strange spool and pro gear...ladder bars . No problems.( knock on wood) car been together for years.




    Now Watch me rip the rear end out of it the first pass of the year.... :?


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