Knocking just sitting there running, knocking when you turn the wheel. Put the front up on jack stands so the front tires are off the ground. Start it up, put your hand on the steering box and have someone turn it left and right. Feel a knock or rough spot? Do again and watch the steering/suspension for issues: parts rubbing or touching. See (can you)? take the drive belt off and run it for 20-30 seconds to see if the noise is gone?
2004 Wrangler Rubicon 4.0 w/Auto
3.5" Rubicon Express Super Flex lift w/Currie Control Arms, RE Mono Tube Shocks, RE CV Drive Shaft, Engine/belly pan skid plate, Co2 Powertank. Hi Lift Jack.