Sounds weird but really only when it rains. I recently replaced a broken front bumper mount, and reprinted a brush guard. Should have no bearing on it though it's all tight and rattle wo the guard. Thinking a shock or end link bushing perhaps?
Any insights would be great.
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Mods: 2003 Granite NA 4X4, KN FIPK, PML, Poly Sway bushings, 32" BFG AT Ko