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99 GMC Superlift 6" susp. lift

EngineCo46

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EngineCo46 New Member

EngineCo46

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I recently installed a Superlift 6" suspension lift on my '99 GMC Sierra 4x4. The lift looks great but rolling down the road, I hear a thumping noise everytime I hit a bump, even small ones. I've checked the ball joints and they are good. Everything else on the kit is tight. Is it possible that the Superlfit shocks could be causing the noise? Any insight would be appreciated.

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