The bolts arent long enough to allow enough shims in between the a-arm and the frame to get the alignment. You will never get the alignment right with 3" springs with factory bolts in there. I'm not sure if 3/4 tons have longer ones or not.
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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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