had the same problem
on a friends car. He went from a GM 12 bolt to a 9 inch ford. The Gm is hub centric and the ford is lug centric. Meaning the wheel fits on the raised portion of the axle to center the wheel on a GM. On a Ford, the style of lugs center the wheel. What happened was the same wheel and lugs were used when he switched to the 9. The wheel would move and get off center causing a vibration at high speeds....basically wheel run out.
You can either change lug style and make sure the wheels is sitting flush on the axle pad or machine a thin spacer with a hubcentric centering ring.
Does this make sense?
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Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
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