is the vibration the "death wobble" or more like a tire out of balance? My 06 F250 had a horrible death wobble on the highway that moved the steering wheel back and forth insanely fast about 30* or so if you were pulling a trailer. I ended up putting a bigger stabilizer shock on it and it "masked" it enough to be safe again. It would only do it if there was an empty trailer on the back. Only thing I could think of is that it put "just enough" weight to make the front at the right point to show the design flaw.
Maybe even unhook the stabilizer to see if it makes it worse?
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Jimmy
69 Camaro - Twin Turbo'd
58 Nomad -348 Baby Rat
www.fquick.com/shmoov69
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