98 Lexus es300 suspension noise.?

Hi. I have a 1998 Lexus es300 and just replaced the rear trailing arm. Now it sounds like a golf ball is bouncing around on my trunk. It seems to happen I make slight turns or go up or down minor hills. I replaced the sway bar links, rear strut and strut hardware, and sway bar bushings on both sides of the rear.... show more Hi. I have a 1998 Lexus es300 and just replaced the rear trailing arm. Now it sounds like a golf ball is bouncing around on my trunk. It seems to happen I make slight turns or go up or down minor hills. I replaced the sway bar links, rear strut and strut hardware, and sway bar bushings on both sides of the rear. Only thing left back there is the rear lateral links. The noise is coming from the rear passenger side. Thank for responding.
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