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You say the nuts and bolts are tight. You checked all of the shock bolts, caliper bolts, spring/shackle bolts, u-bolts etc?
Could it be the added leaf contacting the other leafs without a teflon pad or something?
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2006 F150 FX4 Super Crew - 5100's leveled 2", 35" BFG KM2's, AEM Brute Force Intake, Xcal 2 (VMP), 15% tint, ARE Z-Series, Hella Heads...
2003 VW Jetta GLI VR6 six speed, 2" drop on 18's, eibach sway bars, magnaflow catback
My Trucks
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