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  1. #1
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    Default Propshaft alignment

    There is a guy in our area that bought a Rocky sans a gearbox and TC.|

    He had a pre 1998 Toyota 2.8D 4x4 gearbox and TC fitted. He had a Rocky bellhousing and they cut and joined the two housings.

    The only thing is the alignment of the propshaft to the pumpkins, especially the one at the back. There is an angle, not very acute, but there.

    The universals will handle the the offset, the purpose of universals.

    My question is...to my mind the 'more straight' the propshaft is, the less strain on the universals. Or am I missing something?

    My first words to him was, you will have to watch your universals, they might need to be replaced more regularly.
    Robert van den Berg...(fully vaccinated with two Pfizer jabs & certified)

    '98 Daihatsu Rocky 'The Kitty' (jabbed with 50ppm)
    '02 Daihatsu Rocky 'The Bully' (jabbed with 50ppm)

  2. #2
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    Default Re: Propshaft alignment

    The universals can take a lot of angle without issue, what is important is that the gearbox and diff is parallel to each other, or as close as possible.

    If the diff and gearbox are sitting at different angles you get accelerated wear and vibration on the universals

    Even on stationary equipment your dont mount the propshaft perfectly straight as the universals wear on only 1 spot so wear out quicker.
    Last edited by mullerza; 2021/09/09 at 07:05 PM.
    Anton Muller

    "That which can be asserted without evidence, can be dismissed without evidence." Christopher Hitchens.

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  4. #3
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    Default Re: Propshaft alignment

    Yes Prof, the lower the angle the better ,although it is still better to have a small angle instead of dead straight otherwise the needle bearings will wear into the universal cross journalís due lack of movement.

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  6. #4
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    Default Re: Propshaft alignment

    I am quite certain that members such as @grips or @reenen who has done conversions will be able to assist wrt advice.
    Current - 2009 Mazda BT50 3.0CRDi 4x4 d/c
    Previous - 2005 Ranger 2.5 tdi 4x2 d/c (277 422km)

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  8. #5
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    Default Re: Propshaft alignment

    The rear pinion must point straight at the transfer case output. Put a double Cardon joint top, normal UJ at the axle.
    Jakes Louw
    2012 Jeep Sahara Unlimited 3.6 V6
    Percivamus

  9. #6
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    Default Re: Propshaft alignment

    On live axle suspension, the vertical angle changes all the time.
    "Nothing in the world is more dangerous than sincere ignorance and conscientious stupidity" - Martin Luther king Jr

    2006 VW Touareg V10 (Sold)
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  11. #7
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    Default Re: Propshaft alignment

    Prof to answer you. The more in line the better. I have tilt rear diff`s to reduce angles.

    But then have a look a the front shaft of a 76 F250 with a low pinion front diff. Those front props sit at quite and angle straight from the factory and as far as I can remember UJ
    were not effected.

    If there is no vibration then things will be fine.

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  13. #8
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    Default Re: Propshaft alignment

    One most important factor. The angle of the UJ at the diff must be the same as the angle of the UJ at the gearbox output shaft and in phase.
    There is never a right time to do the wrong thing and never a wrong time to do the right thing!

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