2''or 3'' Shackles On My 03 Lightning?
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Cam bolts (camber) are for the front. The vibration is related to the pinion angle being off. Take it to an alingment shop and have them reverse the shims and do an alingment, which needs to be done anyhow. Do a search under my name and you can see what I went through and how to learn from my mistakes. Good luck.