My wife called me today at work to tell me my son was broke down along the road with his 66 mustang 6 cylinder automatic. She said the left side motor mount was broke. I told her to have a roll back bring it home. When he went to wench it onto the truck the wheel where locked even when it was in neutral. he had to drag it up on the truck. When I got home I did find the motor mount broke. If you put it in reverse it will back up, and if you put it in neutral you can drift it backward, but cant push it forward in neutral or any of the forward gears. I ordered new mounts but I am wondering what is in store for me with the transmission, does anyone have a clue what may have happened.