Rear tranny mount?
There is a transmission mount at the rear of the engine (driver's side)
Front and Rear cross member mounts at the side of the engine (front and rear of engine bay)
and the front engine mount (passengers side)
The front and rear cross member take a lot of torque when the engine is rev'd and cause majority movement.
The transmission has one mount attached to it and if you have problems shifting, that is probably the culprit.
The front aka passenger mount transfers a lot of NVH and does not do as much movement as I thought it would.
I hope this helps you, sir.