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Technical Drive shaft angle?

Discussion in 'The Hokey Ass Message Board' started by vintage44, May 19, 2019.

  1. vintage44
    Joined: Dec 27, 2007
    Posts: 266

    from NY
    1. New York H.A.M.B.ers

    I'm at the point where I need to determine the correct angle range for the driveshaft to have in the rear end to tranny connection. Suggestions? Thanks
  2. Torana68
    Joined: Jan 28, 2008
    Posts: 1,035

    from Australia

  3. Hnstray
    Joined: Aug 23, 2009
    Posts: 10,230

    from Quincy, IL

    There are numerous threads on this topic and even a video link in one of them.

    Basically, the center line thru the engine/trans crankshaft should/must be parallel with the centerline of the pinion shaft in the rear end. Not ‘aimed’ at or directly in line with but parallel. Unless you have an unusually short driveshaft or jacked up suspension, the resulting ujoint operating angles should be within their normal operating range.

    Suggest you do a thread search for more info if what I wrote hear is not clear.
    Last edited: May 19, 2019
    pitman likes this.
  4. sunbeam
    Joined: Oct 22, 2010
    Posts: 3,907


    The angle can varie quite a bit and be OK but they need to be within 1/2 degree of each other.. On high hp cars if the joint has a jerk try to keep it in compression.
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  5. Make sure the u-joints are in phase with each other.
  6. It’s so simple
    But each build can have its own variables
    What are you working on with pics

    The gold standard term that must be adhered to is parallel. Second in line is Ujoint working angles.

    The quantity of degrees is about 6th or 7th on the list. Don’t start there
    jaw22w likes this.
  7. This video shows why it's necessary to keep the input and output angles of the u-joints as equal as possible.

  8. pitman
    Joined: May 14, 2006
    Posts: 4,575

    from Hampsha

    If you can maintain a minimum, of 3°
    the ujoint is believed to pump lube thru.
    I aim for 3, but 5, 6 are okay too. In paired align as mentioned above.
  9. jaw22w
    Joined: Mar 2, 2013
    Posts: 656

    from Indiana

    I'll bet this is the most asked question on the HAMB. I just don't understand why. People make it way harder than it needs to be. It's really simple. Transmission output shaft parallel to the pinion shaft at ride height. 1/2 to 3 degree working angle in the U joint. 2 simple rules. The only exception might be a parallel leaf rear suspension and high horsepower.
  10. Mike VV
    Joined: Sep 28, 2010
    Posts: 1,383

    Mike VV
    from SoCal

    The internet is a wonderful thing...if you use it !
    There are charts, descriptions, drawings ALL OVER the internet on this same subject.

    Hnstray likes this.

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