Hey guys, this is my first XC90. It's an '05 with the V-8, has 196K miles. I believe I am having some transmission issues. The car goes real smooth on the up shift when picking up speed. As soon as I back off on the throttle, it shakes like the motor is falling out. When I'm coasting down on speed, you can feel the jerk when it down shifts. On one of those shakes, it did something to the rear main. It's leaking oil, leaving about a 12" spot in an hour. What I'm asking is this a common problem or is there something else going on? Any input?