Check your motor mounts. It might be time for new ones. The problem with adding mounts to keep things from moving is that you subject the case to forces it wasn't designed for. This leads to the torque cracking the case in half and you getting pulled home after cleaning up a bunch of fluids. I run poly mounts all the way around and my case doesn't move much. I am hoping to move to solid mounting to get better clearence for some parts. Then nothing will move.