Is this noise while the car is sitting still? Or moving? Turning slow?
Most of them are quite clunky if clutching while rolling slow, especially if turning slow. Driveline clearances and torque suddenly released can make everything clunk. Especially with an LS diff, the clutches will be dragging a bit on slow turns and you can get a clunk/pop when everything releases. Changing the diff lube and 10 slow figure 8s can help with that.