Hi all, I had a similar problem however it was comming from the front, I must admit at first I thought it was from the rear but it turned out to be the steering rack. When you put the lowered front springs on the front of the car it alters the angle of the front trailing arm and emphisises any play you have in the steering rack. Fortunatly the steering rack on the D does have some ajustment shims to enable the rack to be tightened up when it gets sloppy. This might not be the same as the problem you are experiencing but it might be worth a look. Has anyone else experienced a knocking sound after putting lowering springs on? Regards James RG UK