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Rear Lower Trailing Arm-Axle Housing Separation on Prado 120

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  • Rear Lower Trailing Arm-Axle Housing Separation on Prado 120

    Hey everyone,

    Continuing on the theme of suspension measurements on the rear 4-link for the 120, I was interested to know the geometry for the separation between the lower trailing arm and the axle housing.

    It has been quoted in several places that the lower trailing arm will bind on the differential axle housing. This is also one of the principal sales reasons behind offset arms made by Superior Engineering and Roadsafe.

    Cross-flexing on my Stanfred ramps and measuring the gaps on both sides gave me quite a large data range, giving the following relationship between shock length and rear lower trailing arm-axle housing separation;




    Extrapolation of the data shows that the arm won’t bind until a shock length around 800mm.

    This means those running very long rear shocks without a swaybar shouldn’t have any binding issues on the 4-link. The upper trailing arm won’t bind on the fuel tank until around 740mm, and the lower trailing arm won’t bind on the axle housing until around 800mm.

    The longest shock I’ve heard of in the back of a 120 is 700mm being run by member 8608.

    Based on the extrapolation of my upper and lower trailing arm measurements, we are never in danger of binding anything, so I’m very curious to know the source of the fuel tank and axle housing binding claims.

    Even so, the after market trailing arms are much stronger than the OEM arms, and on this basis alone I will eventually replace my OEM trailing arms. The upper arms are particularly weak, and it is clear that a significant proportion of anti-squat is running through them and breaking them in very remote locations.

    Anyone know where the claims of trailing arm binding on the 120 originate from?

    Best

    Mark
    Whitey
    Shockie Maker of the Month Award
    Last edited by Whitey; 20-09-2017, 04:35 PM. Reason: Plot update
    2006 GXL petrol auto. ARB deluxe bar x3 HID IPF's, ARB alloy roofrack, ARB awning, BFG A/T, Safari snorkel, Piranha breathers, Pacemaker extractors, custom Ironman 45710FE 436-569mm with Dobinsons 350, custom Ironman 45682FE 383-618mm with Dobinsons 487, Firestone kevlar 60psi airbags, 30mm extended Roadsafe links, AMTS bashplate and recovery points, ABR Flyer with Powersonic AGM.

  • #2
    Interesting information.

    When i click the link it only shows a very small graph where everything is unreadable. Any chance for a larger one?

    From memory Im running a a 700mm or 720mm long rear shock. ill have to double check the part numbers.

    Comment


    • #3
      Originally posted by mannypace View Post
      Any chance for a larger one?



      Hope that is better for you.

      Cheers Andrew
      AJ120
      Out of control poster!
      Last edited by AJ120; 21-03-2015, 08:52 PM.
      [COLOR="#FF0000"]So Long and Thanks for all the Fish![/COLOR]

      [url=http://www.4wdadventurers.com/showthread.php?3840-AJ-s-120-Prado]MY PRADO AND DIY CAMPER TRAILER[/url]

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      Comment


      • #4
        Hey all,

        Thanks Andrew for posting a bigger image.

        A small update for this thread as well, I discovered the information on binding I was looking for in the FJ blue room, see here for a very long and detailed thread concerning binding limits on the 4-link;

        http://www.fjcruiserforums.com/forum...uspension.html

        The binding limits are real, and with the long travel Icon setup the FJ crowd are running, they are really pushing the limits of the 4-link geometry.

        I'm not a fan of the massive bumpstop spacing blocks and sacrificing a swaybar.

        Best

        Mark
        2006 GXL petrol auto. ARB deluxe bar x3 HID IPF's, ARB alloy roofrack, ARB awning, BFG A/T, Safari snorkel, Piranha breathers, Pacemaker extractors, custom Ironman 45710FE 436-569mm with Dobinsons 350, custom Ironman 45682FE 383-618mm with Dobinsons 487, Firestone kevlar 60psi airbags, 30mm extended Roadsafe links, AMTS bashplate and recovery points, ABR Flyer with Powersonic AGM.

        Comment


        • #5
          Hey again,

          I forgot to mention that the binding limits from the FJ thread have been determined with the rear axle housing parallel at full droop. At full articulation, such as my cross-flexed measurements above, the limits will always be larger in shock length compared to parallel full droop.

          mannypace, I'd be very interested to know what rear shocks you're running, and if you've spaced your bumpstops?

          Best

          Mark
          2006 GXL petrol auto. ARB deluxe bar x3 HID IPF's, ARB alloy roofrack, ARB awning, BFG A/T, Safari snorkel, Piranha breathers, Pacemaker extractors, custom Ironman 45710FE 436-569mm with Dobinsons 350, custom Ironman 45682FE 383-618mm with Dobinsons 487, Firestone kevlar 60psi airbags, 30mm extended Roadsafe links, AMTS bashplate and recovery points, ABR Flyer with Powersonic AGM.

          Comment


          • #6
            Hi Mark,

            Looks like im mistaken with my shock length.

            From memory im running f4-be5-2474-h0 on my 120 series

            I cant find the numbers at the moment in the bilstein catalog. Ill try and dig them up fo exact specs unless someone already has them
            mannypace
            Lurker
            Last edited by mannypace; 22-03-2015, 11:22 PM. Reason: incorrect part numbers

            Comment

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