Wheel hop
Mine is mostly street with drag radial but my Demon was sufferring from wheel hop also. And I had "porpoising" as I went through the gears. My pinion snubber was 1/2" from floor and I had pinion down 6 degrees. I removed pinion snubber, (went back to stock) and adjusted pinion to 4 degrees down. No wheel hop or porpoising after I made the changes.
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