My 2004 4runner is equipped with the XREAS system and I just upgraded the front suspension with Rancho's QuickLift complete strut assembly (instead of using a spacer). Now the rear suspension is making a clunk noise when on an uneven road or while going over a bump. It almost seems like the car might be bottoming out. However, there are no signs of this happening. All nuts and bolts are tight, and all bushings are in good condition, so do you think that it may be something internal such as in the rear shock? I know the XREAS system connects the front and rear shocks, so I'm thinking that all the fluid has drained out. Any help would be greatly appreciated!