I have a 4" lift installed and have the same noise that your talking about. Since the lift has been installed, I have upgraded just about everything under the front end. I will keep the list short, the only thing that hasn't been replaced is my lower control arms. I have rcv performace cv axles and that changed nothing. I've had multiple people ride in my jeep and ask me what the heck that noise was. Me personally, I just turn up the radio.
2006 Jeep Commander Limited 4.7L QD II.....[I]4in Super lift Supension lift, AEM Brute Force CAI, Defender Roof Rack, 285 70R17 ProComp Xtreme Mud Terrain II tires, Mickey Thompson Classic II wheels, Rear grab handles, polished throttle body, RCV performance CV Axles, 4X Guard belly guard, front guard, jeepinbyals upper control arms, borla cat back exhaust and LED off road bar 40" and dully D2's.
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