So a while ago, i was getting pretty bad engine rocking (sounded like the engine was going to drop out whenever the wheels spun up), and combined with my inexperience with how NVH works, i had the large rubber bush on the dogbone mount replaced with a poly one, the original had split and was allowing almost free movement back and forth. This was a huge hassle as the mount was damn near impossible to install with the new bush in place. Eventually i got it in. Instantly, huge vibrations