I was under my truck yesterday checking my u-joints and noticed that when I push up on the driveshaft the whole transmission moves up. The only other experience that I've had with tranny mounts was on an old Dodge that I had and the mount was completely destroyed so the whole transmission moved all over the place. I can't really see the mount so it's hard to tell if it's bad. It's not like the tranny slides all over the place, but it does move more than I would think is normal. I can move it about a half inch in all directions (except down, obviously) but it always returns to the original position. Btw, I've got about 83k miles on the truck.