[9secfirebird]

that could be afew things
a) if something is wrong with the motor, like vaccum line cracked or something that would cause the motor to shake when the load is put on. slight misfire could do the same
B) that shake would come more from the motor mounts, if the cars engine is running properly. the trans mount is at the tailshaft, and by that time any shakes of that big motor have been obsorbed by the time they get all the way down to that single point.
C) change the mount if you want to, its cheap enough and its something some people do just cuz.
think of it this way, if you have the money and dont wanan buy anything else, replace it and call it preventative maintenance, if ya change it and ended up needing it, then call yourself a hero.
its very hard for anyone to really diagnose a car over a message board ya know? so do what you think should be done and if it wasnt the trans mount and you replace it and its something else.....at least ya know how to change a trans mount and you have a new one in