Sorry if this has already been answered. I looked through the previous threads and didnt see the answer. Some where close. On my 06 Silverado crew cab Z71 when I put it in gear like drive or switch from drive to reverse you hear a clunk sound from under the truck right by the cab. I have been under the truck to check the u-joints. They dont seem to move much but i cant tell if the u-joint is moving or if it is the yoke moving in the t-case? Anyone have the same issue or have any ideas? Thank in advance.