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Originally Posted by F18
DieselAddict,
I think the random bumping and bounce on a rough road does not allow the shimmy to start. The shimmy is a uniform oscillation like a swing of a pendulum. Why it starts at around 55mph and ends at 60mph??? There must be some sort of harmonic trigger associated with the speed.
The one time I replaced the A-Arm Bearings on the 84 300SD the shimmy returned in about 45K miles, which was about 14 months worth of driving at the time. That was not worth all the fuss so I learned to ignore it and drive above 60 or below 56MPH.
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I have the same understanding of the problem as you do. It is an oscillation like you say that requires certain conditions to start and keep going. I guess around 55 mph the wheels are rotating at the correct frequency to trigger this oscillation or resonance. Theoretically and much the same way, you could blow out your neighbor's windows with a gentle sound if you could find the correct frequency that matches the structural resonance of the glass.
I'm surprised your '84 had the same problem. I thought this problem was limited to the W210 chassis. Of all the cars that I've had in my life, this is the only one that has this problem and it is indeed a bad design.