My mustang has 106,000 miles, and I'm doing the trans swap and when I took the trans off the engine shakes a lot of it move it with your hand. Is that normal? Also if I don't keep the back end of the tranny jacked up (with the crossmember removed) the engine and tranny tilt back a lot at a steep angle. Could this mean that the motor mounts are bad? I looked at them and they don't look torn up, cracked, or anything bad.