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Thread: Drive shafts

  1. #31
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    So what is the "critical speed" with a dynotech driveshaft with 4.10 gears?
    Member #462
    2004 DTR II
    2005 H-D E Glide Classic
    2009 Super Glide Custom

    "Come See a Fat Old Man Sometime"
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  2. #32
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    If you google you can look this up by length and material (and wall thickness)
    Steve H., Charles County, MD www.carfap.com
    1994 Lincoln Town Car. 98-02 front brakes, P71 steering and sway bars, Eaton swap build underway using TorkTech 4.6 2v intake kit.
    2011 Infiniti M37x
    2004 F250, v10 6 speed manual. ex-US Forest Service truck
    2000 BMW M5
    1976 Jeep DJ5 (postal)

  3. #33
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    Darn,I was hoping to get away without having to do any cyphering,the 6 years I spent in 5th grade didn't leave me well prepared for all that,lol
    Member #462
    2004 DTR II
    2005 H-D E Glide Classic
    2009 Super Glide Custom

    "Come See a Fat Old Man Sometime"
    http://www.youtube.com/watch?v=IlB7bz0TrZM

  4. #34
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    Our D/s is around 55" if I remember correctly. That being the case:

    A 3.5" (stock diameter) 6061 shaft would have a critical speed of around 7400 rpms. A 4" 6061 would be barely higher, around 30 rpms higher. Not worth mentioning from a crit speed standpoint, but the 4" shaft will obviously be stronger.

    Factor in the gear ratios to find what the road speed will be at this critical speed.

    Isn't the stock aluminum drivehsaft already 6000 series aluminum? If that is the case than a 6061 stock size shaft would offer no benefit
    Last edited by Stranger in the Black Sedan; 07-22-2008 at 04:46 AM.
    Steve H., Charles County, MD www.carfap.com
    1994 Lincoln Town Car. 98-02 front brakes, P71 steering and sway bars, Eaton swap build underway using TorkTech 4.6 2v intake kit.
    2011 Infiniti M37x
    2004 F250, v10 6 speed manual. ex-US Forest Service truck
    2000 BMW M5
    1976 Jeep DJ5 (postal)

  5. #35
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    Apr 2006
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    Long Island
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    That's a good one
    Quote Originally Posted by UncleLar View Post
    Darn,I was hoping to get away without having to do any cyphering,the 6 years I spent in 5th grade didn't leave me well prepared for all that,lol

    '98 MGM LS...sold..................... .............................. ..'03 300A...sold 6/17

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