Rubber engine mounts + poly trans mount = snap!!!

My car has rubber engine mounts and a poly trans mount and I have had no problems at all. Is my car that much different from an F-Body? Or is it because of the torque arm on the trans that causes all the problems?

Poly trans mount and rubber engine mounts here as well. TQ arm isnt on the trans anymore though.

I don't think it's related to the torque arm. The problem is that when the engine flexes under load and the trans can't flex with it there is a lot of stress on the tailshaft housing, which is what breaks.