First let me start off by stating that my front dif bushings are shot (the center one anyway), and I hear that clunk when switching gears, or when the tranny downshifts on deceleration. Also, the truck just passed NY state inspection where I know they checked out the ball joints and the wheel bearings for play. The clunk I am hearing is when the truck goes over a bump that causes travel in the front end. I think Im hearing it from both sides. I thought it might actually be the dif bushing as the dif might move a bit as the cv axles put strain on it as the front end travels. I also know that sway bar links are a common item to be replaced on these vehicles. If I was to disconnect both side links and the clunks went away, that would indicate bad links? Visually, everything looks ok. No obvious missing rubber or anything like that.