I just replaced the front and rear mounts in a 95 mtx, and I paid about $60 each from Sentry Ford. I was getting the vibration while idleing, as well as at certain speeds while driving. The mounts solved the problem. My transmission wasn't touching the sub-frame, but it was within about 1/8 inch with the engine off. I suspect that when the engine was running, it may have been actually touching at times. Even after putting in the front and rear mount, I still have less than 1/2 inch of clearance. But, with the new mounts, it is smooth, smooth, smooth.
