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  1. #1
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    Default Suspension component Help

    Looking for some help please on trying to identify a suspension component on my trailer? Please forgive me if it's a silly question, but does anybody know what the marked part of the suspension is? I've also included a zoomed in picture. It's a 10 leaf spring suspension setup with Gabriel Safari shocks and then there is this component with one end attached to the axle and the other end to the chassis. Is it some kind of adjustable torsion bar? Any help would be much appreciated. Thanks

  2. #2
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    Default Re: Suspension component Help

    On a coil sprung suspension that would be called a trailing arm. Why anyone would fit something like that on a leaf spring suspension on a non driven axle on a trailer is beyond me!
    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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  4. #3
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    Default Re: Suspension component Help

    Quote Originally Posted by Francois Theron View Post
    On a coil sprung suspension that would be called a trailing arm. Why anyone would fit something like that on a leaf spring suspension on a non driven axle on a trailer is beyond me!
    I do agree Francois. That setup will put a lot of stress and strain on the leaf and those trailing arms.
    If it was my trailer I would remove them.

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  6. #4
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    Default Re: Suspension component Help

    I can only agree with what has been said so far, only thing I can think is that the builder didn't have confidence in the spring over axle setup in use. A lower control arm/trailing link locates the axle front to back on a vehicle which is a job the leaf spring does very well without any help.


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  8. #5
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    Default Re: Suspension component Help

    Its a combination trailing arm and adjustable "dampner" used to control the axel movement under varying loads independently per wheel.
    Last edited by Estee; 2021/09/24 at 08:49 AM.
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  9. #6
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    Default Re: Suspension component Help

    Adjustable torque rods are the propper name.
    Estee = S T = Sean Towlson

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    Default Re: Suspension component Help

    Quote Originally Posted by Estee View Post
    Adjustable torque rods are the propper name.
    Fortuners have them as well, but they are not adjustable.

  12. #8
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    Default Re: Suspension component Help

    Quote Originally Posted by RoelfleRoux View Post
    Fortuners have them as well, but they are not adjustable.
    Isn't the Fortuner coil sprung?


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  13. #9
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    Default Re: Suspension component Help

    Quote Originally Posted by Estee View Post
    Adjustable torque rods are the propper name.
    Thanks Estee. I haven't seen another trailer with a setup like this, I bought it second hand and the guy I bought it from didn't seem to know what it was either. Do you agree that this is maybe doing more harm than good, based on some of the previous comments?

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  15. #10
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    Default Re: Suspension component Help

    Common in the US and Oz.

    Personnaly I dont think they will do any harm and will have been engineered, probably for a purpose.

    Perhaps research their purpose and use before making a decision. You might fimd some advantages.

    I would leave them but ensure they are equally adjusted.
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  17. #11
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    Default Re: Suspension component Help

    Quote Originally Posted by Estee View Post
    Common in the US and Oz.
    In conjunction with a leaf spring?
    There is never a right time to do the wrong thing and never a wrong time to do the right thing!

  18. #12
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    Default Re: Suspension component Help

    Quote Originally Posted by Estee View Post
    Its a combination trailing arm and adjustable "dampner" used to control the axel movement under varying loads independently per wheel.
    I don't do this lightly as I very much respect your opinion, but I have to disagree with you on this one. It may be an adjustable torque rod, but it has no place on a leaf sprung undriven axle on a trailer.


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  20. #13
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    Default Re: Suspension component Help

    Quote Originally Posted by Ljbezuidenhout View Post
    Thanks Estee. I haven't seen another trailer with a setup like this, I bought it second hand and the guy I bought it from didn't seem to know what it was either. Do you agree that this is maybe doing more harm than good, based on some of the previous comments?
    How much use has this trailer seen? If it didn't cause any problems upto now why worry about it....it might not be the best design decision but is it giving any problems?
    Neil

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  22. #14
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    Default Re: Suspension component Help

    Quote Originally Posted by Francois Theron View Post
    In conjunction with a leaf spring?
    Not an engineer but if I recall its more in conjunction with a beam axel as opposed to the means of suspension.
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  24. #15
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    Default Re: Suspension component Help

    Quote Originally Posted by Francois Theron View Post
    In conjunction with a leaf spring?
    After further research it does appear to be fairly common in leaf spring setups. I seem to find them being called traction bars and are intended to reduce/eliminate axle wrap or wheel hop (specifically found in leaf spring setups). Granted almost all examples I found online are for vehicles and not trailers, but it does seem to be installed for that reason.

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  26. #16
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    Default Re: Suspension component Help

    I agree.

    If ain't broken, don't fix it.
    Although there is a lot of experience on this forum, if something happens to the trailer with it removed, no-one is going to help you.


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  28. #17
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    Default Re: Suspension component Help

    Quote Originally Posted by neoT View Post
    How much use has this trailer seen? If it didn't cause any problems upto now why worry about it....it might not be the best design decision but is it giving any problems?
    Good point, the trailer has seen some fairly rough use without any issues. I'm about to change out the shocks, so will be working on the suspension and so was just trying to figure out what these were and their purpose. More from the point of safety whilst working on the suspension, as I wasn't sure if they were under tension or anything, but it appears not.

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    Default Re: Suspension component Help

    Quote Originally Posted by Estee View Post
    Not an engineer but if I recall its more in conjunction with a beam axel as opposed to the means of suspension.
    The purpose of a torque rod is to help maintain pinion angle and stop axle wrap. This is primarily used on high torque/power rear beam axles. In that application it also is mounted on a bracket that is spaced from the axle. So as to be in a position to resist the torque. In this case aside from the obvious that the axle is undriven the mounting location is flush with the axle and on the same side as the spring. It would do nothing to resist rotation of the axle. The way it is setup it will only limit front to back movement of the axle, which is something the leaf spring should be doing.


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  31. #19
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    Default Re: Suspension component Help

    https://youtu.be/nBUosyrb960

    This video does a pretty good job of explaining how it works, you can also see the mounting of the bar to the axle has some distance from the centre line. You will find this more exaggerated on most installations.

    The key is also that it is a driven axle...

    I am not saying remove it from your trailer, I am just saying I doubt it is doing much good there.


    '12 Audi Q5 3.0 TDi quattro stock standard

    '07 VW Touareg (T2) 3.0 V6 TDi (BKS), Air Suspension, Centre and Rear diff locks, DeCAT, 265-65R17 muds - Sold

    '01 Jeep WJ Limited 4.7 V8 with some bits - Sold
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  33. #20
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    Default Re: Suspension component Help

    Quote Originally Posted by Estee View Post
    Not an engineer but if I recall its more in conjunction with a beam axel as opposed to the means of suspension.
    As mentioned above somewhere, a leaf spring setup by design also acts as the trailing arm/torque rod on an axle. A coils sprung setup has no way of locating the axle in a way to prevent sideways and/ or lateral movement, therefore trailing arms/ torque rods are implemented to locate the axle.

    Thus having leaf springs together with trailing arms make very little sense, especially on a non driven axle. On some high performance or high torque DRIVEN axles on leaf springs, a type of torque rod is sometimes used to prevent axle wrap under high torque applications. On a non driven trailer axle clearly there is no such action.

    In the photo above, the leaves are fixed at on point and free on the other point, leaving the axle to actually move slightly forwards and backwards during suspension movement as the leaves deform. With the torque rod it can only move up and down in a slightly circular motion. I guess in its current design I think movement is restricted.
    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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