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Lick my balls
13,023 Posts
put a shim under the perches, changes the angle slightly, I had to do that when I put on a 6" lift with rear probs yet...
Yes, a shim will help with the vibration if you are in fact over 2* out of alignment. But if you install a shim you have to make some modifications to avoid losing your rear end while doing some serious articulation. Notice the factory block with the pin.

Here is what is left of that pin after the shim is installed.

You can see there is hardly any of the pin left to ancor your rea end. I did a write up about how to remedy this situation here, maybe it will help
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