Hi I've got a question that I can't seem to get a straight answer! I've called belltech and they told me to look at forums for an answer!?!? I've got a 2013 f150 supercab. (extended cab) I ordered 2" rear shackles from belltech to drop the rear and level the truck. I've seen where people have had some issues with vibration. My question is do I need pinion shims? And if so, which ones?
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