I've developed a popping from the driver side front. I believe it may have started or gotten worse near the time i tested out my 4x4 a couple weeks ago. The noise has gotten worse and it is very loud now when the when I turn the wheels. After using a thesescope, we believe it is coming from the lower ball joint or the universal joint type connector on the axle. I took the tire off to take the load off of the ball joints and it still makes the noise, but not as bad and I have to turn the wheels lock to lock to get it to pop. It's a very loud noise, as though metal against metal is binding and then suddenly pops lose, and it happens in small bursts, such as 3 pops at a time. If I turn the wheel right, it may pop 3 times quickly, but will not pop again turning to the right until I turn the wheel back left and make it pop that direction. After that, it will once again pop during a right turn. I just put new ball joints in both the passer and driver sides, upper and lower, about a month ago.