Automatic, 185K. Loud knocking sound from the rear especially when I let off the gas but will do it a little under power. Especially bad on our terrible corduroy roads. One shop says it's the rear struts and wants $600 to replace. Searched some on the net and think it might just be the top mounting plate for the strut(s). Saw a video by "Eric the carguy" that made me think it might be something simple. I can actually feel the knocking when it's really bad. Any thoughts/suggestions appreciated !