Not Ranked
I had similar shaking in the car at 30-35 and then again at 60-70 mph. After Hunter Roadforce balancing several times, adjusting air pressure, alignment, I even had the tires balanced while mounted on the car (now there is a lost art). Nothing seemd to eliminate it to an acceptable level although it would seem to improve slightly. All the tire guys kept saying "get rid of the bias-ply tires". I started thinking all kinds of mechanical things were to blame and disliked driving my car so much it sat. I finally replaced the tires with new radials and woah that made all the difference. It was like driving a different car. I can's say for sure but that might be all you need to do.
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