I just had a vibration problem like that too. I had to shim my tranny up 1/2 inch because of the drop kit setting my angles way off. The vibration ended up ruining my pinion bearing too, so get it fixed right away.
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99 Silverado Ex-Cab 2wd, Bagged&WhippleCharged
02 Sierra Ex-Cab 4wd 2500 HD
The 72 went down the road.
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