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Re: The shakes at 70mph - 4000
> > From: Michel John Wendt <firstname.lastname@example.org>
> > Date: Tue, 11 Oct 1994 20:02:56 -0500 (CDT)
> > Subject: The shakes at 70mph - 4000
> > My '84 4000S with 122k miles gets periodic shimmies (vibrations felt
> > through the steering wheel) at or above 70mph. The condition happens
> > only occasionaly - it seems to occur after running over a
> > particularly rough expansion joint, but can also happen on a smooth
> > surface. It stops as soon as I let up on the accelerator or move the
> > steering wheel slightly to the left (to the right seems to make it worse).
> I've been noticing the same behavior in my '84 4000S with 385k miles
> for the last couple of months. Gets pretty annoying at times. I've tried
> rotating tires back-to-front with no success, then this weekend while I
> was trying to get the squeal out of my brakes, I noticed my right side tie
> rod end had a lot of play. That could definately cause the vibration
> and could be affected by turning slightly. I'm going to get mine
> fixed but you may want to check your tie rod ends.
> Badly worn struts can also cause random shimmying/vibration.
Do check your control arm bushings. They have a habit of going bad.