I know exactly what you are talking about. I swapped an old pair to the front of my sd for a temporary fix. The ones that were on there were pretty darn bad. I put them on and took off down the road and when I hit 50 there was a violent pounding vibration that shook the crap out of the steering wheel and didn't go away untill I slowed way down. I put the old crappier tires back on and it was fine. There was some play in both wheels when wiggled side to side so I put on some tie rods that I had, had an alignment and got new tires. It doesn't pound like it used to, but there is definitely some unpleasant vibrations going on up there around 60 mph. I was told that it is probably the steering dampener or wheel bearings that needed replacement. I'm going to take another look tomorrow.
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