On a suspension test they discovered that one of the front shock absorber has leaked. Therefore I changed both front absorbers and the protective rubber which was damaged. During this I also installed a 3cm leveling kit (plastic spacers from russian tema4x4) on both front and back, did the optics and everything was as I wanted. But I noticed that there was a little sound coming from the back when every now and then. After few weeks the sound is more or less present at all times. I can even hear it if push (rock) the car with my hands on a parking lot. It comes from the rear left. The mechanic checked everything and could find nothing while the car was lifted up. He lubed the rubbers as much as he could. I went to different mechanic who checks for "air in the joints" while the car is down. Some plate under the wheel is moving left and right, and the guy in the canal under a car is looking if everything is ok. No problems. The suspension test shows all four shock absorbers and springs are ok. But the sound is still present. Please help, what else should we look into?