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When I was a kid we suffered with this on an overloaded car. So does this happen worse when the truck is heavily loaded?
In our case it was finally cured once it was realised that the spring or springs had "wound up" i.e. were not just acting in a vertical motion but also in a turning motion, rather like the old fashioned door/gate closers you could buy where opening the gate wound up a vertical coil spring and its unwinding closed the gate.
One would have to assume that somehow the spring seat on either one or both ends of the spring had got displaced somehow. Or the spring had moved in its seat. I suppose the only cure would be to take the spring off, let it settle back down, then refit it.
Worse still would be this
https://www.masterspring.com/2016/08/23/coil-direction-effect-spring-performance-determine/ i.er. springs on opposite sides both being wound the same way.
But I think this would be extremely unlikely! But you never know!
In our case it was finally cured once it was realised that the spring or springs had "wound up" i.e. were not just acting in a vertical motion but also in a turning motion, rather like the old fashioned door/gate closers you could buy where opening the gate wound up a vertical coil spring and its unwinding closed the gate.
One would have to assume that somehow the spring seat on either one or both ends of the spring had got displaced somehow. Or the spring had moved in its seat. I suppose the only cure would be to take the spring off, let it settle back down, then refit it.
Worse still would be this
https://www.masterspring.com/2016/08/23/coil-direction-effect-spring-performance-determine/ i.er. springs on opposite sides both being wound the same way.
But I think this would be extremely unlikely! But you never know!
