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Thread: TR4 Suspension Safety Issue?

  1. #1
    Jedi Knight KVH's Avatar
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    TR4 Suspension Safety Issue?


    I'm having a little difficulty believing that the lower fulcrum bracket of the TR4 suspension, the one that holds the wishbone arms, is held only by one single bolt. I know the TR6s went to two (or think they did), but it seems to me that one lose bolt on a TR4 could be mean major problems. Does this bother anyone else?

  2. #2

    Re: TR4 Suspension Safety Issue?

    It's common to either add the second bolt or obtain TR6 lower mounts. Most later frames already have the second holes drilled.
    PeterK
    1958 TR3A 1966 TR4A both HVDA

  3. #3
    Jedi Warrior Tabcon's Avatar
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    Re: TR4 Suspension Safety Issue?

    I noticed the same exact thing yesterday when I was disassembling the front end.
    Mine were on very tightly though and they are nyloc bolts. From what I understand, most of the force exerted on the front suspension is on the upper A arm where they have castle nuts with cotters installed. Good idea on the second bolt though, I'm going to do that when it all goes back together.
    Tab

    1964 Triumph TR4

    TR4 Resurrected







  4. #4
    Yoda TR4nut's Avatar
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    Re: TR4 Suspension Safety Issue?

    If I understand this thread correctly, I think you are talking about the 4A suspension, which is weak with one bolt holding the lower brackets. The TR4 suspension is different (its the same as the TR3).
    Randy
    64 TR4
    59 TR3A
    60 TR3A
    70 TR6

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    Jedi Trainee TR4A_IRS's Avatar
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    Re: TR4 Suspension Safety Issue?

    Quote Originally Posted by Kentvillehound
    Does this bother anyone else?
    Not me, since mine have lasted over 40 years and 100K miles without failure.
    Ian
    1967 TR4A IRS

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