sway
One more thought about sway. If you try all the suggestions and no results...
Today I looked underneath where the axle is bolted to the frame. Is the axle mounted perpendicular with the frame? In the picture you can see a slot. Is the gap the same on both sides? If the axle is NOT perpendicular with frame a small misalignment [one tire might be more forward than the other] may not appear until you reach the right speed. I am only guessing about this.
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